Sddm not working again

biscotty · April 6, 2026, 12:27pm

I can’t seem to get sddm to launch since about 2 weeks. I can use gdm to log in. I had the same problem a year and a half ago, and solved it by setting sddm.wayland.enable to false. I did try removing that line, but it doesn’t launch either way.

The logs show

Apr 06 06:01:40 nixos sddm-greeter-qt6[1506]: No shell integration named "layer-shell" found
Apr 06 06:01:40 nixos sddm-greeter-qt6[1506]: Loading shell integration failed.
Apr 06 06:01:40 nixos sddm-greeter-qt6[1506]: Attempted to load the following shells QList("layer-shell")
Apr 06 06:01:40 nixos sddm-greeter-qt6[1506]: Could not load the Qt platform plugin "wayland" in "" even though it was found.
Apr 06 06:01:40 nixos sddm-greeter-qt6[1506]: This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.
                                              
                                              Available platform plugins are: offscreen, wayland-brcm, wayland-egl, wayland, minimalegl, eglfs, linuxfb, xcb, vnc, vkkhrdisplay, minimal.
Apr 06 06:01:40 nixos systemd-coredump[1777]: Process 1506 (sddm-greeter-qt) of user 175 terminated abnormally with signal 6/ABRT, processing...
Apr 06 06:01:40 nixos systemd[1]: Created slice Slice /system/drkonqi-coredump-processor.
Apr 06 06:01:40 nixos systemd[1]: Created slice Slice /system/systemd-coredump.
Apr 06 06:01:40 nixos systemd[1]: Started Process Core Dump (PID 1777/UID 0).
Apr 06 06:01:40 nixos systemd[1]: Started Pass systemd-coredump journal entries to relevant user for potential DrKonqi handling.
Apr 06 06:01:40 nixos systemd-timesyncd[500]: Network configuration changed, trying to establish connection.
Apr 06 06:01:40 nixos systemd-timesyncd[500]: Network configuration changed, trying to establish connection.
Apr 06 06:01:40 nixos systemd-timesyncd[500]: Network configuration changed, trying to establish connection.
Apr 06 06:01:40 nixos systemd-timesyncd[500]: Network configuration changed, trying to establish connection.
Apr 06 06:01:40 nixos systemd-timesyncd[500]: Network configuration changed, trying to establish connection.
Apr 06 06:01:40 nixos systemd-timesyncd[500]: Network configuration changed, trying to establish connection.
Apr 06 06:01:40 nixos wireplumber[1733]: [0:00:10.584772789] [1775]  INFO Camera camera_manager.cpp:223 Adding camera '\_SB_.PC00.XHCI.RHUB.HS06-6:1.0-0c45:671e' for pipeline handler uvcvideo
Apr 06 06:01:40 nixos systemd-coredump[1780]: Process 1506 (sddm-greeter-qt) of user 175 dumped core.
                                              
                                              Module /nix/store/36hzsmxz6yfmn5lr88rikg81cyb8373c-sddm-unwrapped-0.21.0/bin/sddm-greeter-qt6 without build-id.
                                              Module libunistring.so.5 without build-id.
                                              Module libselinux.so.1 without build-id.
                                              Module libpsl.so.5 without build-id.
                                              Module libssh2.so.1 without build-id.
                                              Module libidn2.so.0 without build-id.
                                              Module libnghttp2.so.14 without build-id.
                                              Module libngtcp2.so.16 without build-id.
                                              Module libngtcp2_crypto_ossl.so.0 without build-id.
                                              Module libnghttp3.so.9 without build-id.
                                              Module libduktape.so.207 without build-id.
                                              Module libgomp.so.1 without build-id.
                                              Module libffi.so.8 without build-id.
                                              Module libpxbackend-1.0.so without build-id.
                                              Module libbrotlicommon.so.1 without build-id.
                                              Module libkeyutils.so.1 without build-id.
                                              Module libkrb5support.so.0 without build-id.
                                              Module libcom_err.so.3 without build-id.
                                              Module libk5crypto.so.3 without build-id.
                                              Module libkrb5.so.3 without build-id.
                                              Module libgraphite2.so.3 without build-id.
                                              Module libpcre2-8.so.0 without build-id.
                                              Module libexpat.so.1 without build-id.
                                              Module libbz2.so.1 without build-id.
                                              Module libpcre2-16.so.0 without build-id.
                                              Module libb2.so.1 without build-id.
                                              Module libdouble-conversion.so.3 without build-id.
                                              Module libicudata.so.76 without build-id.
                                              Module libicuuc.so.76 without build-id.
                                              Module libicui18n.so.76 without build-id.
                                              Module libproxy.so.1 without build-id.
                                              Module libzstd.so.1 without build-id.
                                              Module libbrotlidec.so.1 without build-id.
                                              Module libgssapi_krb5.so.2 without build-id.
                                              Module libGLdispatch.so.0 without build-id.
                                              Module libXext.so.6 without build-id.
                                              Module libz.so.1 without build-id.
                                              Module libfreetype.so.6 without build-id.
                                              Module libmd4c.so.0 without build-id.
                                              Module libharfbuzz.so.0 without build-id.
                                              Module libpng16.so.16 without build-id.
                                              Module libX11.so.6 without build-id.
                                              Module libfontconfig.so.1 without build-id.
                                              Module libEGL.so.1 without build-id.
                                              Module libvulkan.so without build-id.
                                              Module libXdmcp.so.6 without build-id.
                                              Module libXau.so.6 without build-id.
                                              Module libxkbcommon.so.0 without build-id.
                                              Module libgcc_s.so.1 without build-id.
                                              Module libstdc++.so.6 without build-id.
                                              Module libOpenGL.so.0 without build-id.
                                              Module libGLX.so.0 without build-id.
                                              Module libxcb-xkb.so.1 without build-id.
                                              Module libxcb.so.1 without build-id.
                                              Stack trace of thread 1506:
                                              #0  0x00007f3cfde9fdcc __pthread_kill_implementation (libc.so.6 + 0x9fdcc)
                                              #1  0x00007f3cfde4265e raise (libc.so.6 + 0x4265e)
                                              #2  0x00007f3cfde29350 abort (libc.so.6 + 0x29350)
                                              #3  0x00007f3cfe6d7342 _Z6qAbortv (libQt6Core.so.6 + 0xd7342)
                                              #4  0x00007f3cfe72ff81 _ZL10qt_message9QtMsgTypeRK18QMessageLogContextPKcP13__va_list_tag (libQt6Core.so.6 + 0x12ff81)
                                              #5  0x00007f3cfe6d8bd2 _ZNK14QMessageLogger5fatalEPKcz (libQt6Core.so.6 + 0xd8bd2)
                                              #6  0x00007f3cffb48877 _ZL13init_platformRK7QStringS1_S1_RiPPc.cold (libQt6Gui.so.6 + 0x148877)
                                              #7  0x00007f3cffc03a82 _ZN22QGuiApplicationPrivate25createPlatformIntegrationEv (libQt6Gui.so.6 + 0x203a82)
                                              #8  0x00007f3cffc046e0 _ZN22QGuiApplicationPrivate21createEventDispatcherEv (libQt6Gui.so.6 + 0x2046e0)
                                              #9  0x00007f3cfe7c787d _ZN23QCoreApplicationPrivate4initEv (libQt6Core.so.6 + 0x1c787d)
                                              #10 0x00007f3cffc092dd _ZN22QGuiApplicationPrivate4initEv (libQt6Gui.so.6 + 0x2092dd)
                                              #11 0x00007f3cffc0ae69 _ZN15QGuiApplicationC2ERiPPci (libQt6Gui.so.6 + 0x20ae69)
                                              #12 0x0000564070d37c46 main (/nix/store/36hzsmxz6yfmn5lr88rikg81cyb8373c-sddm-unwrapped-0.21.0/bin/sddm-greeter-qt6 + 0x14c46)
                                              #13 0x00007f3cfde2b285 __libc_start_call_main (libc.so.6 + 0x2b285)
                                              #14 0x00007f3cfde2b338 __libc_start_main@@GLIBC_2.34 (libc.so.6 + 0x2b338)
                                              #15 0x0000564070d38585 _start (/nix/store/36hzsmxz6yfmn5lr88rikg81cyb8373c-sddm-unwrapped-0.21.0/bin/sddm-greeter-qt6 + 0x15585)
                                              ELF object binary architecture: AMD x86-64
Apr 06 06:01:40 nixos sddm-helper-start-wayland[1501]: wayland greeter finished 6 QProcess::CrashExit
Apr 06 06:01:40 nixos sddm-helper-start-wayland[1501]: quitting helper-start-wayland
Apr 06 06:01:40 nixos sddm-helper-start-wayland[1501]: Stopping... "/nix/store/6j9i1w0qf0y7k6cppy4y79d6n1mw7740-kwin-6.6.3/bin/kwin_wayland"
Apr 06 06:01:40 nixos systemd[1]: systemd-coredump@0-1-1777_1778-0.service: Deactivated successfully.
Apr 06 06:01:40 nixos systemd[1]: systemd-coredump@0-1-1777_1778-0.service: Consumed 81ms CPU time over 131ms wall clock time, 29.3M memory peak, 12.5M read from disk, 964K written to disk.
Apr 06 06:01:40 nixos sddm-helper-start-wayland[1501]: wayland compositor finished 15 QProcess::NormalExit
Apr 06 06:01:40 nixos sddm-helper-start-wayland[1501]: quitting helper-start-wayland
Apr 06 06:01:40 nixos sddm-helper[1239]: [PAM] Closing session
Apr 06 06:01:40 nixos drkonqi-coredump-processor[1781]: "/nix/store/36hzsmxz6yfmn5lr88rikg81cyb8373c-sddm-unwrapped-0.21.0/bin/sddm-greeter-qt6" 1506 "/var/lib/systemd/coredump/core.sddm-greeter-qt.175.2b3b8e065f1442a99493e6e17d3c585f.1506.1775476900000000.zst"
Apr 06 06:01:40 nixos drkonqi-coredump-processor[1781]: The socket path doesn't exist @ "/run/user/175/drkonqi-coredump-launcher"
Apr 06 06:01:40 nixos systemd[1]: drkonqi-coredump-processor@0-1-1777_1778-0.service: Deactivated successfully.
Apr 06 06:01:40 nixos systemd[1]: drkonqi-coredump-processor@0-1-1777_1778-0.service: Consumed 37ms CPU time over 222ms wall clock time, 25.3M memory peak, 17.5M read from disk.
Apr 06 06:01:41 nixos kernel: r8169 0000:02:00.0 enp2s0: Link is Up - 1Gbps/Full - flow control rx/tx
Apr 06 06:01:41 nixos avahi-daemon[930]: Joining mDNS multicast group on interface enp2s0.IPv6 with address fe80::c584:e4e5:a697:aff9.
Apr 06 06:01:41 nixos avahi-daemon[930]: New relevant interface enp2s0.IPv6 for mDNS.
Apr 06 06:01:41 nixos sddm-helper[1239]: [PAM] Ended.
Apr 06 06:01:41 nixos sddm[1172]: Auth: sddm-helper exited successfully
Apr 06 06:01:41 nixos sddm[1172]: Greeter stopped. SDDM::Auth::HELPER_SUCCESS

My config is simply

  services.displayManager.sddm = {
    enable = true;
    theme = "sddm-chili-theme";
    wayland.enable = false;
  };

Thanks in advance for any help.

Brian

malloc · April 6, 2026, 1:54pm

services.displayManager.sddm.wayland.enable = false;

The default value for this configuration is already false [1], so it has no effect.

Based on:


Apr 06 06:01:40 nixos sddm-greeter-qt6[1506]: Could not load the Qt platform plugin "wayland" in "" even though it was found. Apr 06 06:01:40 nixos sddm-greeter-qt6[1506]: This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Seems issue is related to services.displayManager.sddm.theme = "sddm-chili-theme";. Try setting this to:

services.displayManager.sddm.theme = "${pkgs.sddm-chili-theme}/share/sddm/themes/chili";

[1] https://search.nixos.org/options?channel=unstable&query=sddm&show=services.displayManager.sddm.wayland.enable

biscotty · April 6, 2026, 9:25pm

Thanks, but altering the theme declaration didn’t help.

I guess the default for wayland.enable has changed in the past years, makes sense. Thanks for the info.

Cheers

tree-sapii · April 6, 2026, 11:24pm

I think it wants wayland enabled.

biscotty · April 7, 2026, 12:44pm

Thanks. I tried setting wayland.enable to true. Still fails in the same way.

malloc · April 7, 2026, 8:20pm

Seems sddm-chili is quite an old theme built on Qt5:


### Dependencies[](https://github.com/MarianArlt/sddm-chili#dependencies)
- sddm
- qt5
- qt5-quickcontrols
- qt5-graphicaleffects

https://github.com/MarianArlt/sddm-chili

nixpkgs sddm is built with Qt6 [1]. Plus, I noticed a few qt6 dynamically linked objects in your stack trace/dump:


#3 0x00007f3cfe6d7342 _Z6qAbortv (libQt6Core.so.6 + 0xd7342) #4 0x00007f3cfe72ff81 _ZL10qt_message9QtMsgTypeRK18QMessageLogContextPKcP13__va_list_tag (libQt6Core.so.6 + 0x12ff81) #5 0x00007f3cfe6d8bd2 _ZNK14QMessageLogger5fatalEPKcz (libQt6Core.so.6 + 0xd8bd2) #6 0x00007f3cffb48877 _ZL13init_platformRK7QStringS1_S1_RiPPc.cold (libQt6Gui.so.6 + 0x148877)

So if you truly want to use this theme, you may have to write an overlay to use qt5 and rebuild sddm from source; or downgrade sddm with overlay.

Not sure if there’s another alternative. Good luck.

[1] https://github.com/NixOS/nixpkgs/blob/7dcba2420a27e468b5522d2e399131b7e5596748/pkgs/applications/display-managers/sddm/unwrapped.nix#L77

biscotty · April 8, 2026, 5:20pm

On your excellent suggestion I tried a different theme. I used the astronaut one which says it is a qt6 theme. When I tried it with wayland.enable = true, I got the same results as before. If I try with wayland.enable = false, I get different sddm errors. (Honestly, I don’t care about the greeter. The only problem with gdm for me is that it doesn’t seem to log in with a zsh shell because lines in .zlogin don’t execute, while they do when I use sddm.)

pr 08 11:01:30 nixos sddm[1189]: Initializing...
Apr 08 11:01:30 nixos sddm[1189]: Starting...
Apr 08 11:01:30 nixos sddm[1189]: Logind interface found
Apr 08 11:01:30 nixos sddm[1189]: Adding new display...
Apr 08 11:01:30 nixos sddm[1189]: Loaded empty theme configuration
Apr 08 11:01:30 nixos sddm[1189]: Xauthority path: "/run/sddm/xauth_llPPpG"
Apr 08 11:01:30 nixos sddm[1189]: Using VT 2
Apr 08 11:01:30 nixos sddm[1189]: Display server starting...
Apr 08 11:01:30 nixos sddm[1189]: Writing cookie to "/run/sddm/xauth_llPPpG"
Apr 08 11:01:30 nixos sddm[1189]: Running: /nix/store/j4smnx9bdzwv4b1jg7r2ml456zn0xqi1-xserver-wrapper -nolisten tcp -background none -seat seat0 vt2 -auth /run/sddm/xauth_llPPpG -noreset -displayfd 16
Apr 08 11:01:30 nixos sddm[1189]: Failed to read display number from pipe
Apr 08 11:01:30 nixos sddm[1189]: Display server stopping...
Apr 08 11:01:30 nixos sddm[1189]: Attempt 1 starting the Display server on vt 2 failed
Apr 08 11:01:32 nixos sddm[1189]: Display server starting...
Apr 08 11:01:32 nixos sddm[1189]: Writing cookie to "/run/sddm/xauth_llPPpG"
Apr 08 11:01:32 nixos sddm[1189]: Running: /nix/store/j4smnx9bdzwv4b1jg7r2ml456zn0xqi1-xserver-wrapper -nolisten tcp -background none -seat seat0 vt2 -auth /run/sddm/xauth_llPPpG -noreset -displayfd 16
Apr 08 11:01:33 nixos sddm[1189]: Failed to read display number from pipe
Apr 08 11:01:33 nixos sddm[1189]: Display server stopping...
Apr 08 11:01:33 nixos sddm[1189]: Attempt 2 starting the Display server on vt 2 failed
Apr 08 11:01:34 nixos sddm[1189]: Display server starting...
Apr 08 11:01:34 nixos sddm[1189]: Writing cookie to "/run/sddm/xauth_llPPpG"
Apr 08 11:01:34 nixos sddm[1189]: Running: /nix/store/j4smnx9bdzwv4b1jg7r2ml456zn0xqi1-xserver-wrapper -nolisten tcp -background none -seat seat0 vt2 -auth /run/sddm/xauth_llPPpG -noreset -displayfd 16
Apr 08 11:01:35 nixos sddm[1189]: Failed to read display number from pipe
Apr 08 11:01:35 nixos sddm[1189]: Display server stopping...
Apr 08 11:01:35 nixos sddm[1189]: Attempt 3 starting the Display server on vt 2 failed
Apr 08 11:01:35 nixos sddm[1189]: Could not start Display server on vt 2
Apr 08 11:01:48 nixos sddm[1189]: Signal received: SIGTERM
```

malloc · April 8, 2026, 8:54pm

Strange output with X11:


Apr 08 11:01:30 nixos sddm[1189]: Loaded empty theme configuration

But did not see any messages trying to load your specified theme.

I had issues with sddm recently, but even this mentioned the theme I was using querying the display-manager.service logs[1]:

…

Mar 28 15:58:54 vainglory sddm[1619]: Loading theme configuration from "/run/current-system/sw/share/sddm/themes/catppuccin-mocha-mauve/theme.> Mar 28 15:58:54 vainglory sddm[1619]: Greeter starting...

Assuming you haven’t rebooted, share output from:

journalctl —boot —since="2026-04-08 11:01:30" —until="2026-04-08 11:01:48"

Also try with …wayland.enable = true, reboot, and share boot logs with same command and tweaking the —since … and —until… switches for appropriate date and times.

biscotty · April 8, 2026, 11:04pm

Thanks for hanging in on this. I have rebooted, but know which logs apply. Above is with astronaut theme and wayland not enabled. The output with astronaut and wayland enabled was

grep sddm <(journalctl -b -4)

Apr 08 10:57:11 nixos sddm[1187]: Initializing...
Apr 08 10:57:11 nixos sddm[1187]: Starting...
Apr 08 10:57:11 nixos sddm[1187]: Logind interface found
Apr 08 10:57:11 nixos sddm[1187]: Adding new display...
Apr 08 10:57:11 nixos sddm[1187]: Loaded empty theme configuration
Apr 08 10:57:11 nixos sddm[1187]: Using VT 1
Apr 08 10:57:11 nixos sddm[1187]: Display server started.
Apr 08 10:57:11 nixos sddm[1187]: Socket server starting...
Apr 08 10:57:11 nixos sddm[1187]: Socket server started.
Apr 08 10:57:11 nixos sddm[1187]: The configured theme "astronaut" doesn't exist, using the embedded theme instead
Apr 08 10:57:11 nixos sddm[1187]: Loaded empty theme configuration
Apr 08 10:57:11 nixos sddm[1187]: Greeter starting...
Apr 08 10:57:11 nixos sddm-helper[1249]: [PAM] Starting...
Apr 08 10:57:11 nixos sddm-helper[1249]: [PAM] Authenticating...
Apr 08 10:57:11 nixos sddm-helper[1249]: [PAM] returning.
Apr 08 10:57:11 nixos systemd-logind[1002]: New session 'c1' of user 'sddm' with class 'greeter' and type 'wayland'.
Apr 08 10:57:11 nixos (systemd)[1335]: pam_unix(systemd-user:session): session opened for user sddm(uid=175) by (uid=0)
Apr 08 10:57:11 nixos systemd-logind[1002]: New session '1' of user 'sddm' with class 'manager-early' and type 'unspecified'.
Apr 08 10:57:12 nixos systemd[1335]: Cleanup lingering KCrash metadata skipped, unmet condition check ConditionPathExistsGlob=/var/lib/sddm/.cache/kcrash-metadata/*.ini
Apr 08 10:57:12 nixos systemd[1335]: Submitting pending crash events skipped, unmet condition check ConditionPathExistsGlob=/var/lib/sddm/.cache/drkonqi/sentry-envelopes/*
Apr 08 10:57:12 nixos systemd[1335]: Cleanup lingering KCrash metadata skipped, unmet condition check ConditionPathExistsGlob=/var/lib/sddm/.cache/kcrash-metadata/*.ini
Apr 08 10:57:12 nixos systemd[1]: Started Session c1 of User sddm.
Apr 08 10:57:12 nixos sddm-helper[1505]: Jumping to VT 1
Apr 08 10:57:12 nixos sddm-helper[1505]: VT mode fixed
Apr 08 10:57:12 nixos sddm[1187]: Greeter session started successfully
Apr 08 10:57:12 nixos sddm-helper-start-wayland[1505]: Starting Wayland process "/nix/store/6j9i1w0qf0y7k6cppy4y79d6n1mw7740-kwin-6.6.3/bin/kwin_wayland --no-global-shortcuts --no-kactivities --no-lockscreen --locale1" "sddm"
Apr 08 10:57:12 nixos sddm-helper-start-wayland[1505]: started succesfully "/nix/store/6j9i1w0qf0y7k6cppy4y79d6n1mw7740-kwin-6.6.3/bin/kwin_wayland --no-global-shortcuts --no-kactivities --no-lockscreen --locale1"
Apr 08 10:57:12 nixos sddm-helper-start-wayland[1505]: "Failed to gain real time thread priority (See CAP_SYS_NICE in the capabilities(7) man page). error: Operation not permitted\n"
Apr 08 10:57:12 nixos sddm-helper-start-wayland[1505]: "No backend specified, automatically choosing drm\n"
Apr 08 10:57:12 nixos sddm-helper-start-wayland[1505]: Directory "/run/user/175" has changed, checking for Wayland socket
Apr 08 10:57:12 nixos sddm-helper-start-wayland[1505]: Found Wayland socket "/run/user/175/wayland-0"
Apr 08 10:57:12 nixos sddm-helper-start-wayland[1505]: "Accepting client connections on sockets: QList(\"wayland-0\")\n"
Apr 08 10:57:12 nixos sddm-greeter-qt6[1510]: High-DPI autoscaling Enabled
Apr 08 10:57:12 nixos sddm-helper-start-wayland[1505]: "Failed to gain real time thread priority (See CAP_SYS_NICE in the capabilities(7) man page). error: Operation not permitted\n"
Apr 08 10:57:12 nixos sddm-helper-start-wayland[1505]: "Failed to gain real time thread priority (See CAP_SYS_NICE in the capabilities(7) man page). error: Operation not permitted\n"
Apr 08 10:57:12 nixos sddm-helper-start-wayland[1505]: "Failed to gain real time thread priority (See CAP_SYS_NICE in the capabilities(7) man page). error: Operation not permitted\n"
Apr 08 10:57:12 nixos sddm-helper-start-wayland[1505]: "\"applications.menu\"  not found in  QList(\"/run/current-system/sw/etc/xdg/menus\")\n"
Apr 08 10:57:13 nixos sddm-helper-start-wayland[1505]: "qmlRegisterType requires absolute URLs.\n"
Apr 08 10:57:13 nixos sddm-helper-start-wayland[1505]: "qmlRegisterType requires absolute URLs.\nqmlRegisterType requires absolute URLs.\n"
Apr 08 10:57:13 nixos sddm-helper-start-wayland[1505]: "qmlRegisterType requires absolute URLs.\n"
Apr 08 10:57:13 nixos sddm-helper-start-wayland[1505]: "qmlRegisterType requires absolute URLs.\n"
Apr 08 10:57:13 nixos sddm-helper-start-wayland[1505]: "qmlRegisterType requires absolute URLs.\n"
Apr 08 10:57:13 nixos sddm-helper-start-wayland[1505]: "qmlRegisterType requires absolute URLs.\n"
Apr 08 10:57:13 nixos sddm-helper-start-wayland[1505]: "qmlRegisterType requires absolute URLs.\n"
Apr 08 10:57:13 nixos sddm-helper-start-wayland[1505]: "qmlRegisterType requires absolute URLs.\n"
Apr 08 10:57:13 nixos sddm-helper-start-wayland[1505]: "qmlRegisterType requires absolute URLs.\n"
Apr 08 10:57:13 nixos sddm-helper-start-wayland[1505]: "qmlRegisterType requires absolute URLs.\n"
Apr 08 10:57:13 nixos sddm-helper-start-wayland[1505]: "qmlRegisterType requires absolute URLs.\n"
Apr 08 10:57:13 nixos sddm-helper-start-wayland[1505]: "qmlRegisterType requires absolute URLs.\n"
Apr 08 10:57:13 nixos sddm-helper-start-wayland[1505]: "qmlRegisterType requires absolute URLs.\n"
Apr 08 10:57:13 nixos sddm-helper-start-wayland[1505]: "qmlRegisterType requires absolute URLs.\n"
Apr 08 10:57:13 nixos sddm-helper-start-wayland[1505]: "qmlRegisterType requires absolute URLs.\n"
Apr 08 10:57:13 nixos sddm-helper-start-wayland[1505]: "qmlRegisterType requires absolute URLs.\n"
Apr 08 10:57:13 nixos sddm-helper-start-wayland[1505]: "qmlRegisterType requires absolute URLs.\n"
Apr 08 10:57:13 nixos sddm-helper-start-wayland[1505]: "qmlRegisterType requires absolute URLs.\n"
Apr 08 10:57:13 nixos sddm-helper-start-wayland[1505]: "qmlRegisterType requires absolute URLs.\n"
Apr 08 10:57:13 nixos sddm-helper-start-wayland[1505]: "qmlRegisterType requires absolute URLs.\n"
Apr 08 10:57:13 nixos sddm-helper-start-wayland[1505]: "qmlRegisterType requires absolute URLs.\n"
Apr 08 10:57:13 nixos sddm-helper-start-wayland[1505]: "qmlRegisterType requires absolute URLs.\n"
Apr 08 10:57:13 nixos sddm-helper-start-wayland[1505]: "qmlRegisterType requires absolute URLs.\n"
Apr 08 10:57:13 nixos sddm-helper-start-wayland[1505]: "qmlRegisterType requires absolute URLs.\n"
Apr 08 10:57:13 nixos sddm-helper-start-wayland[1505]: "qmlRegisterType requires absolute URLs.\n"
Apr 08 10:57:13 nixos sddm-helper-start-wayland[1505]: "qmlRegisterType requires absolute URLs.\n"
Apr 08 10:57:13 nixos sddm-helper-start-wayland[1505]: "qmlRegisterType requires absolute URLs.\n"
Apr 08 10:57:13 nixos sddm-helper-start-wayland[1505]: "qmlRegisterType requires absolute URLs.\n"
Apr 08 10:57:13 nixos sddm-helper-start-wayland[1505]: "qmlRegisterType requires absolute URLs.\n"
Apr 08 10:57:13 nixos sddm-helper-start-wayland[1505]: "qmlRegisterType requires absolute URLs.\n"
Apr 08 10:57:13 nixos sddm-helper-start-wayland[1505]: "qmlRegisterType requires absolute URLs.\n"
Apr 08 10:57:13 nixos sddm-helper-start-wayland[1505]: "qmlRegisterType requires absolute URLs.\n"
Apr 08 10:57:13 nixos sddm-helper-start-wayland[1505]: "qmlRegisterType requires absolute URLs.\n"
Apr 08 10:57:13 nixos sddm-helper-start-wayland[1505]: "qmlRegisterType requires absolute URLs.\n"
Apr 08 10:57:13 nixos sddm-helper-start-wayland[1505]: "qmlRegisterType requires absolute URLs.\n"
Apr 08 10:57:13 nixos sddm-helper-start-wayland[1505]: "qmlRegisterType requires absolute URLs.\n"
Apr 08 10:57:13 nixos sddm-helper-start-wayland[1505]: "qmlRegisterType requires absolute URLs.\n"
Apr 08 10:57:13 nixos sddm-helper-start-wayland[1505]: "qmlRegisterType requires absolute URLs.\n"
Apr 08 10:57:13 nixos sddm-helper-start-wayland[1505]: "qmlRegisterType requires absolute URLs.\n"
Apr 08 10:57:13 nixos sddm-greeter-qt6[1510]: No shell integration named "layer-shell" found
Apr 08 10:57:13 nixos sddm-greeter-qt6[1510]: Loading shell integration failed.
Apr 08 10:57:13 nixos sddm-greeter-qt6[1510]: Attempted to load the following shells QList("layer-shell")
Apr 08 10:57:13 nixos sddm-greeter-qt6[1510]: Could not load the Qt platform plugin "wayland" in "" even though it was found.
Apr 08 10:57:13 nixos sddm-greeter-qt6[1510]: This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.
Apr 08 10:57:13 nixos systemd-coredump[1782]: Process 1510 (sddm-greeter-qt) of user 175 terminated abnormally with signal 6/ABRT, processing...
Apr 08 10:57:13 nixos systemd-coredump[1785]: Process 1510 (sddm-greeter-qt) of user 175 dumped core.
                                              Module /nix/store/36hzsmxz6yfmn5lr88rikg81cyb8373c-sddm-unwrapped-0.21.0/bin/sddm-greeter-qt6 without build-id.
                                              #12 0x000056318b790c46 main (/nix/store/36hzsmxz6yfmn5lr88rikg81cyb8373c-sddm-unwrapped-0.21.0/bin/sddm-greeter-qt6 + 0x14c46)
                                              #15 0x000056318b791585 _start (/nix/store/36hzsmxz6yfmn5lr88rikg81cyb8373c-sddm-unwrapped-0.21.0/bin/sddm-greeter-qt6 + 0x15585)
Apr 08 10:57:13 nixos sddm-helper-start-wayland[1505]: wayland greeter finished 6 QProcess::CrashExit
Apr 08 10:57:13 nixos sddm-helper-start-wayland[1505]: quitting helper-start-wayland
Apr 08 10:57:13 nixos sddm-helper-start-wayland[1505]: Stopping... "/nix/store/6j9i1w0qf0y7k6cppy4y79d6n1mw7740-kwin-6.6.3/bin/kwin_wayland"
Apr 08 10:57:13 nixos sddm-helper-start-wayland[1505]: wayland compositor finished 15 QProcess::NormalExit
Apr 08 10:57:13 nixos sddm-helper-start-wayland[1505]: quitting helper-start-wayland
Apr 08 10:57:13 nixos sddm-helper[1249]: [PAM] Closing session
Apr 08 10:57:13 nixos drkonqi-coredump-processor[1786]: "/nix/store/36hzsmxz6yfmn5lr88rikg81cyb8373c-sddm-unwrapped-0.21.0/bin/sddm-greeter-qt6" 1510 "/var/lib/systemd/coredump/core.sddm-greeter-qt.175.f0c3e54c323a41629fcc0da21eeaaa0d.1510.1775667433000000.zst"
Apr 08 10:57:14 nixos sddm-helper[1249]: [PAM] Ended.
Apr 08 10:57:14 nixos sddm[1187]: Auth: sddm-helper exited successfully
Apr 08 10:57:14 nixos sddm[1187]: Greeter stopped. SDDM::Auth::HELPER_SUCCESS
Apr 08 10:57:23 nixos sddm[1187]: Signal received: SIGTERM
Apr 08 10:57:23 nixos sddm[1187]: Socket server stopping...
Apr 08 10:57:23 nixos sddm[1187]: Socket server stopped.
Apr 08 10:57:23 nixos (sd-pam)[1346]: pam_unix(systemd-user:session): session closed for user sddm
```

biscotty · April 9, 2026, 4:11pm

I fixed the syntax for the theme, which I had wrong. Different output but the same error about qt plugin can’t be loaded. Now, wayland enabled, the output is:

❯ grep sddm <(journalctl -b -3)
Apr 09 10:04:26 nixos sddm[1189]: Initializing...
Apr 09 10:04:26 nixos sddm[1189]: Starting...
Apr 09 10:04:26 nixos sddm[1189]: Logind interface found
Apr 09 10:04:26 nixos sddm[1189]: Adding new display...
Apr 09 10:04:26 nixos sddm[1189]: Loaded empty theme configuration
Apr 09 10:04:26 nixos sddm[1189]: Using VT 1
Apr 09 10:04:26 nixos sddm[1189]: Display server started.
Apr 09 10:04:26 nixos sddm[1189]: Socket server starting...
Apr 09 10:04:26 nixos sddm[1189]: Socket server started.
Apr 09 10:04:26 nixos sddm[1189]: Loading theme configuration from "/run/current-system/sw/share/sddm/themes/sddm-astronaut-theme/Themes/astronaut.conf"
Apr 09 10:04:26 nixos sddm[1189]: Greeter starting...
Apr 09 10:04:26 nixos sddm-helper[1255]: [PAM] Starting...
Apr 09 10:04:26 nixos sddm-helper[1255]: [PAM] Authenticating...
Apr 09 10:04:26 nixos sddm-helper[1255]: [PAM] returning.
Apr 09 10:04:26 nixos systemd-logind[969]: New session 'c1' of user 'sddm' with class 'greeter' and type 'wayland'.
Apr 09 10:04:26 nixos (systemd)[1337]: pam_unix(systemd-user:session): session opened for user sddm(uid=175) by (uid=0)
Apr 09 10:04:26 nixos systemd-logind[969]: New session '1' of user 'sddm' with class 'manager-early' and type 'unspecified'.
Apr 09 10:04:27 nixos systemd[1337]: Cleanup lingering KCrash metadata skipped, unmet condition check ConditionPathExistsGlob=/var/lib/sddm/.cache/kcrash-metadata/*.ini
Apr 09 10:04:27 nixos systemd[1337]: Submitting pending crash events skipped, unmet condition check ConditionPathExistsGlob=/var/lib/sddm/.cache/drkonqi/sentry-envelopes/*
Apr 09 10:04:27 nixos systemd[1337]: Cleanup lingering KCrash metadata skipped, unmet condition check ConditionPathExistsGlob=/var/lib/sddm/.cache/kcrash-metadata/*.ini
Apr 09 10:04:27 nixos systemd[1]: Started Session c1 of User sddm.
Apr 09 10:04:27 nixos sddm-helper[1522]: Jumping to VT 1
Apr 09 10:04:27 nixos sddm-helper[1522]: VT mode fixed
Apr 09 10:04:27 nixos sddm[1189]: Greeter session started successfully
Apr 09 10:04:27 nixos sddm-helper-start-wayland[1522]: Starting Wayland process "/nix/store/6j9i1w0qf0y7k6cppy4y79d6n1mw7740-kwin-6.6.3/bin/kwin_wayland --no-global-shortcuts --no-kactivities --no-lockscreen --locale1" "sddm"
Apr 09 10:04:27 nixos sddm-helper-start-wayland[1522]: started succesfully "/nix/store/6j9i1w0qf0y7k6cppy4y79d6n1mw7740-kwin-6.6.3/bin/kwin_wayland --no-global-shortcuts --no-kactivities --no-lockscreen --locale1"
Apr 09 10:04:27 nixos sddm-helper-start-wayland[1522]: "Failed to gain real time thread priority (See CAP_SYS_NICE in the capabilities(7) man page). error: Operation not permitted\n"
Apr 09 10:04:27 nixos sddm-helper-start-wayland[1522]: "No backend specified, automatically choosing drm\n"
Apr 09 10:04:27 nixos sddm-helper-start-wayland[1522]: Directory "/run/user/175" has changed, checking for Wayland socket
Apr 09 10:04:27 nixos sddm-helper-start-wayland[1522]: Found Wayland socket "/run/user/175/wayland-0"
Apr 09 10:04:27 nixos sddm-helper-start-wayland[1522]: "Accepting client connections on sockets: QList(\"wayland-0\")\n"
Apr 09 10:04:27 nixos sddm-greeter-qt6[1527]: High-DPI autoscaling Enabled
Apr 09 10:04:27 nixos sddm-helper-start-wayland[1522]: "Failed to gain real time thread priority (See CAP_SYS_NICE in the capabilities(7) man page). error: Operation not permitted\n"
Apr 09 10:04:27 nixos sddm-helper-start-wayland[1522]: "Failed to gain real time thread priority (See CAP_SYS_NICE in the capabilities(7) man page). error: Operation not permitted\n"
Apr 09 10:04:27 nixos sddm-helper-start-wayland[1522]: "Failed to gain real time thread priority (See CAP_SYS_NICE in the capabilities(7) man page). error: Operation not permitted\n"
Apr 09 10:04:28 nixos sddm-helper-start-wayland[1522]: "qmlRegisterType requires absolute URLs.\nqmlRegisterType requires absolute URLs.\n"
Apr 09 10:04:28 nixos sddm-helper-start-wayland[1522]: "qmlRegisterType requires absolute URLs.\nqmlRegisterType requires absolute URLs.\n"
Apr 09 10:04:28 nixos sddm-helper-start-wayland[1522]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:04:28 nixos sddm-helper-start-wayland[1522]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:04:28 nixos sddm-helper-start-wayland[1522]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:04:28 nixos sddm-helper-start-wayland[1522]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:04:28 nixos sddm-helper-start-wayland[1522]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:04:28 nixos sddm-helper-start-wayland[1522]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:04:28 nixos sddm-helper-start-wayland[1522]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:04:28 nixos sddm-helper-start-wayland[1522]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:04:28 nixos sddm-helper-start-wayland[1522]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:04:28 nixos sddm-helper-start-wayland[1522]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:04:28 nixos sddm-helper-start-wayland[1522]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:04:28 nixos sddm-helper-start-wayland[1522]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:04:28 nixos sddm-helper-start-wayland[1522]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:04:28 nixos sddm-helper-start-wayland[1522]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:04:28 nixos sddm-helper-start-wayland[1522]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:04:28 nixos sddm-helper-start-wayland[1522]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:04:28 nixos sddm-helper-start-wayland[1522]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:04:28 nixos sddm-helper-start-wayland[1522]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:04:28 nixos sddm-helper-start-wayland[1522]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:04:28 nixos sddm-helper-start-wayland[1522]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:04:28 nixos sddm-helper-start-wayland[1522]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:04:28 nixos sddm-helper-start-wayland[1522]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:04:28 nixos sddm-helper-start-wayland[1522]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:04:28 nixos sddm-helper-start-wayland[1522]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:04:28 nixos sddm-helper-start-wayland[1522]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:04:28 nixos sddm-helper-start-wayland[1522]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:04:28 nixos sddm-helper-start-wayland[1522]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:04:28 nixos sddm-helper-start-wayland[1522]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:04:28 nixos sddm-helper-start-wayland[1522]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:04:28 nixos sddm-helper-start-wayland[1522]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:04:28 nixos sddm-helper-start-wayland[1522]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:04:28 nixos sddm-helper-start-wayland[1522]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:04:28 nixos sddm-helper-start-wayland[1522]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:04:28 nixos sddm-helper-start-wayland[1522]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:04:28 nixos sddm-helper-start-wayland[1522]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:04:28 nixos sddm-helper-start-wayland[1522]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:04:28 nixos sddm-greeter-qt6[1527]: No shell integration named "layer-shell" found
Apr 09 10:04:28 nixos sddm-greeter-qt6[1527]: Loading shell integration failed.
Apr 09 10:04:28 nixos sddm-greeter-qt6[1527]: Attempted to load the following shells QList("layer-shell")
Apr 09 10:04:28 nixos sddm-greeter-qt6[1527]: Could not load the Qt platform plugin "wayland" in "" even though it was found.
Apr 09 10:04:28 nixos sddm-greeter-qt6[1527]: This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.
Apr 09 10:04:28 nixos systemd-coredump[1799]: Process 1527 (sddm-greeter-qt) of user 175 terminated abnormally with signal 6/ABRT, processing...
Apr 09 10:04:28 nixos systemd-coredump[1802]: Process 1527 (sddm-greeter-qt) of user 175 dumped core.
                                              Module /nix/store/36hzsmxz6yfmn5lr88rikg81cyb8373c-sddm-unwrapped-0.21.0/bin/sddm-greeter-qt6 without build-id.
                                              #12 0x00005607ce6c0c46 main (/nix/store/36hzsmxz6yfmn5lr88rikg81cyb8373c-sddm-unwrapped-0.21.0/bin/sddm-greeter-qt6 + 0x14c46)
                                              #15 0x00005607ce6c1585 _start (/nix/store/36hzsmxz6yfmn5lr88rikg81cyb8373c-sddm-unwrapped-0.21.0/bin/sddm-greeter-qt6 + 0x15585)
Apr 09 10:04:28 nixos sddm-helper-start-wayland[1522]: wayland greeter finished 6 QProcess::CrashExit
Apr 09 10:04:28 nixos sddm-helper-start-wayland[1522]: quitting helper-start-wayland
Apr 09 10:04:28 nixos sddm-helper-start-wayland[1522]: Stopping... "/nix/store/6j9i1w0qf0y7k6cppy4y79d6n1mw7740-kwin-6.6.3/bin/kwin_wayland"
Apr 09 10:04:28 nixos sddm-helper-start-wayland[1522]: wayland compositor finished 15 QProcess::NormalExit
Apr 09 10:04:28 nixos sddm-helper-start-wayland[1522]: quitting helper-start-wayland
Apr 09 10:04:28 nixos sddm-helper[1255]: [PAM] Closing session
Apr 09 10:04:28 nixos drkonqi-coredump-processor[1803]: "/nix/store/36hzsmxz6yfmn5lr88rikg81cyb8373c-sddm-unwrapped-0.21.0/bin/sddm-greeter-qt6" 1527 "/var/lib/systemd/coredump/core.sddm-greeter-qt.175.dc72957180964f009085d43d086467f6.1527.1775750668000000.zst"
Apr 09 10:04:29 nixos sddm-helper[1255]: [PAM] Ended.
Apr 09 10:04:29 nixos sddm[1189]: Auth: sddm-helper exited successfully
Apr 09 10:04:29 nixos sddm[1189]: Greeter stopped. SDDM::Auth::HELPER_SUCCESS
Apr 09 10:04:39 nixos (sd-pam)[1357]: pam_unix(systemd-user:session): session closed for user sddm
Apr 09 10:04:39 nixos sddm[1189]: Signal received: SIGTERM
Apr 09 10:04:39 nixos sddm[1189]: Socket server stopping...
Apr 09 10:04:39 nixos sddm[1189]: Socket server stopped.
```

I tried using the kwin compositor, and got this.

Apr 09 10:22:12 nixos sddm[1186]: Initializing...
Apr 09 10:22:12 nixos sddm[1186]: Starting...
Apr 09 10:22:12 nixos sddm[1186]: Logind interface found
Apr 09 10:22:12 nixos sddm[1186]: Adding new display...
Apr 09 10:22:12 nixos sddm[1186]: Loaded empty theme configuration
Apr 09 10:22:12 nixos sddm[1186]: Using VT 1
Apr 09 10:22:12 nixos sddm[1186]: Display server started.
Apr 09 10:22:12 nixos sddm[1186]: Socket server starting...
Apr 09 10:22:12 nixos sddm[1186]: Socket server started.
Apr 09 10:22:12 nixos sddm[1186]: Loading theme configuration from "/run/current-system/sw/share/sddm/themes/sddm-astronaut-theme/Themes/astronaut.conf"
Apr 09 10:22:12 nixos sddm[1186]: Greeter starting...
Apr 09 10:22:12 nixos sddm-helper[1252]: [PAM] Starting...
Apr 09 10:22:12 nixos sddm-helper[1252]: [PAM] Authenticating...
Apr 09 10:22:12 nixos sddm-helper[1252]: [PAM] returning.
Apr 09 10:22:12 nixos systemd-logind[1005]: New session 'c1' of user 'sddm' with class 'greeter' and type 'wayland'.
Apr 09 10:22:12 nixos (systemd)[1347]: pam_unix(systemd-user:session): session opened for user sddm(uid=175) by (uid=0)
Apr 09 10:22:12 nixos systemd-logind[1005]: New session '1' of user 'sddm' with class 'manager-early' and type 'unspecified'.
Apr 09 10:22:13 nixos systemd[1347]: Cleanup lingering KCrash metadata skipped, unmet condition check ConditionPathExistsGlob=/var/lib/sddm/.cache/kcrash-metadata/*.ini
Apr 09 10:22:13 nixos systemd[1347]: Submitting pending crash events skipped, unmet condition check ConditionPathExistsGlob=/var/lib/sddm/.cache/drkonqi/sentry-envelopes/*
Apr 09 10:22:13 nixos systemd[1347]: Cleanup lingering KCrash metadata skipped, unmet condition check ConditionPathExistsGlob=/var/lib/sddm/.cache/kcrash-metadata/*.ini
Apr 09 10:22:13 nixos systemd[1]: Started Session c1 of User sddm.
Apr 09 10:22:13 nixos sddm-helper[1525]: Jumping to VT 1
Apr 09 10:22:13 nixos sddm-helper[1525]: VT mode fixed
Apr 09 10:22:13 nixos sddm[1186]: Greeter session started successfully
Apr 09 10:22:13 nixos sddm-helper-start-wayland[1525]: Starting Wayland process "/nix/store/6j9i1w0qf0y7k6cppy4y79d6n1mw7740-kwin-6.6.3/bin/kwin_wayland --no-global-shortcuts --no-kactivities --no-lockscreen --locale1" "sddm"
Apr 09 10:22:13 nixos sddm-helper-start-wayland[1525]: started succesfully "/nix/store/6j9i1w0qf0y7k6cppy4y79d6n1mw7740-kwin-6.6.3/bin/kwin_wayland --no-global-shortcuts --no-kactivities --no-lockscreen --locale1"
Apr 09 10:22:13 nixos sddm-helper-start-wayland[1525]: "Failed to gain real time thread priority (See CAP_SYS_NICE in the capabilities(7) man page). error: Operation not permitted\n"
Apr 09 10:22:13 nixos sddm-helper-start-wayland[1525]: "No backend specified, automatically choosing drm\n"
Apr 09 10:22:13 nixos sddm-helper-start-wayland[1525]: Directory "/run/user/175" has changed, checking for Wayland socket
Apr 09 10:22:13 nixos sddm-helper-start-wayland[1525]: Found Wayland socket "/run/user/175/wayland-0"
Apr 09 10:22:13 nixos sddm-helper-start-wayland[1525]: "Accepting client connections on sockets: QList(\"wayland-0\")\n"
Apr 09 10:22:13 nixos sddm-greeter-qt6[1530]: High-DPI autoscaling Enabled
Apr 09 10:22:13 nixos sddm-helper-start-wayland[1525]: "Failed to gain real time thread priority (See CAP_SYS_NICE in the capabilities(7) man page). error: Operation not permitted\n"
Apr 09 10:22:13 nixos sddm-helper-start-wayland[1525]: "Failed to gain real time thread priority (See CAP_SYS_NICE in the capabilities(7) man page). error: Operation not permitted\n"
Apr 09 10:22:13 nixos sddm-helper-start-wayland[1525]: "Failed to gain real time thread priority (See CAP_SYS_NICE in the capabilities(7) man page). error: Operation not permitted\n"
Apr 09 10:22:14 nixos sddm-helper-start-wayland[1525]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:22:14 nixos sddm-helper-start-wayland[1525]: "qmlRegisterType requires absolute URLs.\nqmlRegisterType requires absolute URLs.\n"
Apr 09 10:22:14 nixos sddm-helper-start-wayland[1525]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:22:14 nixos sddm-helper-start-wayland[1525]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:22:14 nixos sddm-helper-start-wayland[1525]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:22:14 nixos sddm-helper-start-wayland[1525]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:22:14 nixos sddm-helper-start-wayland[1525]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:22:14 nixos sddm-helper-start-wayland[1525]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:22:14 nixos sddm-helper-start-wayland[1525]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:22:14 nixos sddm-helper-start-wayland[1525]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:22:14 nixos sddm-helper-start-wayland[1525]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:22:14 nixos sddm-helper-start-wayland[1525]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:22:14 nixos sddm-helper-start-wayland[1525]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:22:14 nixos sddm-helper-start-wayland[1525]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:22:14 nixos sddm-helper-start-wayland[1525]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:22:14 nixos sddm-helper-start-wayland[1525]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:22:14 nixos sddm-helper-start-wayland[1525]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:22:14 nixos sddm-helper-start-wayland[1525]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:22:14 nixos sddm-helper-start-wayland[1525]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:22:14 nixos sddm-helper-start-wayland[1525]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:22:14 nixos sddm-helper-start-wayland[1525]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:22:14 nixos sddm-helper-start-wayland[1525]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:22:14 nixos sddm-helper-start-wayland[1525]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:22:14 nixos sddm-helper-start-wayland[1525]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:22:14 nixos sddm-helper-start-wayland[1525]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:22:14 nixos sddm-helper-start-wayland[1525]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:22:14 nixos sddm-helper-start-wayland[1525]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:22:14 nixos sddm-helper-start-wayland[1525]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:22:14 nixos sddm-helper-start-wayland[1525]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:22:14 nixos sddm-helper-start-wayland[1525]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:22:14 nixos sddm-helper-start-wayland[1525]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:22:14 nixos sddm-helper-start-wayland[1525]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:22:14 nixos sddm-helper-start-wayland[1525]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:22:14 nixos sddm-helper-start-wayland[1525]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:22:14 nixos sddm-helper-start-wayland[1525]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:22:14 nixos sddm-helper-start-wayland[1525]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:22:14 nixos sddm-helper-start-wayland[1525]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:22:14 nixos sddm-helper-start-wayland[1525]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:22:14 nixos sddm-helper-start-wayland[1525]: "qmlRegisterType requires absolute URLs.\n"
Apr 09 10:22:14 nixos sddm-greeter-qt6[1530]: No shell integration named "layer-shell" found
Apr 09 10:22:14 nixos sddm-greeter-qt6[1530]: Loading shell integration failed.
Apr 09 10:22:14 nixos sddm-greeter-qt6[1530]: Attempted to load the following shells QList("layer-shell")
Apr 09 10:22:14 nixos sddm-greeter-qt6[1530]: Could not load the Qt platform plugin "wayland" in "" even though it was found.
Apr 09 10:22:14 nixos sddm-greeter-qt6[1530]: This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.
Apr 09 10:22:14 nixos systemd-coredump[1802]: Process 1530 (sddm-greeter-qt) of user 175 terminated abnormally with signal 6/ABRT, processing...
Apr 09 10:22:14 nixos systemd-coredump[1805]: Process 1530 (sddm-greeter-qt) of user 175 dumped core.
                                              Module /nix/store/36hzsmxz6yfmn5lr88rikg81cyb8373c-sddm-unwrapped-0.21.0/bin/sddm-greeter-qt6 without build-id.
                                              #12 0x000055b75127ac46 main (/nix/store/36hzsmxz6yfmn5lr88rikg81cyb8373c-sddm-unwrapped-0.21.0/bin/sddm-greeter-qt6 + 0x14c46)
                                              #15 0x000055b75127b585 _start (/nix/store/36hzsmxz6yfmn5lr88rikg81cyb8373c-sddm-unwrapped-0.21.0/bin/sddm-greeter-qt6 + 0x15585)
Apr 09 10:22:14 nixos sddm-helper-start-wayland[1525]: wayland greeter finished 6 QProcess::CrashExit
Apr 09 10:22:14 nixos sddm-helper-start-wayland[1525]: quitting helper-start-wayland
Apr 09 10:22:14 nixos sddm-helper-start-wayland[1525]: Stopping... "/nix/store/6j9i1w0qf0y7k6cppy4y79d6n1mw7740-kwin-6.6.3/bin/kwin_wayland"
Apr 09 10:22:14 nixos drkonqi-coredump-processor[1806]: "/nix/store/36hzsmxz6yfmn5lr88rikg81cyb8373c-sddm-unwrapped-0.21.0/bin/sddm-greeter-qt6" 1530 "/var/lib/systemd/coredump/core.sddm-greeter-qt.175.9f7477ae67cb4bd3853bfe8633311f8b.1530.1775751734000000.zst"
Apr 09 10:22:14 nixos sddm-helper-start-wayland[1525]: wayland compositor finished 15 QProcess::NormalExit
Apr 09 10:22:14 nixos sddm-helper-start-wayland[1525]: quitting helper-start-wayland
Apr 09 10:22:14 nixos sddm-helper[1252]: [PAM] Closing session
Apr 09 10:22:15 nixos sddm-helper[1252]: [PAM] Ended.
Apr 09 10:22:15 nixos sddm[1186]: Auth: sddm-helper exited successfully
Apr 09 10:22:15 nixos sddm[1186]: Greeter stopped. SDDM::Auth::HELPER_SUCCESS
Apr 09 10:22:24 nixos sddm[1186]: Signal received: SIGTERM
Apr 09 10:22:24 nixos sddm[1186]: Socket server stopping...
Apr 09 10:22:24 nixos sddm[1186]: Socket server stopped.
Apr 09 10:22:24 nixos (sd-pam)[1365]: pam_unix(systemd-user:session): session closed for user sddm
```

biscotty · April 9, 2026, 4:55pm

For fun I tried lightdm. Sadly, that fails, too. But very different errors. I’m starting to think it’s my computer. FWIW, dms-greeter works. Just freezes on logouts.

Apr 09 10:48:22 nixos kernel: i915 0000:00:02.0: [drm] Found tigerlake/uy (device ID 9a49) integrated display version 12.00 stepping C0
Apr 09 10:48:24 nixos systemd[1]: display-manager.service: Main process exited, code=exited, status=1/FAILURE
Apr 09 10:48:24 nixos systemd[1]: display-manager.service: Failed with result 'exit-code'.
Apr 09 10:48:24 nixos systemd[1]: display-manager.service: Consumed 181ms CPU time over 596ms wall clock time, 45.7M memory peak, 39.8M read from disk.
Apr 09 10:48:24 nixos systemd[1]: display-manager.service: Triggering OnFailure= dependencies.
Apr 09 10:48:24 nixos systemd[1]: display-manager.service: Failed to enqueue OnFailure=plymouth-quit.service job, ignoring: Unit plymouth-quit.service not found.
Apr 09 10:48:25 nixos systemd[1]: display-manager.service: Scheduled restart job, restart counter is at 1.
Apr 09 10:48:25 nixos systemd[1]: display-manager.service: Main process exited, code=exited, status=1/FAILURE
Apr 09 10:48:25 nixos systemd[1]: display-manager.service: Failed with result 'exit-code'.
Apr 09 10:48:25 nixos systemd[1]: display-manager.service: Triggering OnFailure= dependencies.
Apr 09 10:48:25 nixos systemd[1]: display-manager.service: Failed to enqueue OnFailure=plymouth-quit.service job, ignoring: Unit plymouth-quit.service not found.
Apr 09 10:48:25 nixos systemd[1]: display-manager.service: Scheduled restart job, restart counter is at 2.
Apr 09 10:48:25 nixos systemd[1]: display-manager.service: Main process exited, code=exited, status=1/FAILURE
Apr 09 10:48:25 nixos systemd[1]: display-manager.service: Failed with result 'exit-code'.
Apr 09 10:48:25 nixos systemd[1]: display-manager.service: Triggering OnFailure= dependencies.
Apr 09 10:48:25 nixos systemd[1]: display-manager.service: Failed to enqueue OnFailure=plymouth-quit.service job, ignoring: Unit plymouth-quit.service not found.
Apr 09 10:48:26 nixos systemd[1]: display-manager.service: Scheduled restart job, restart counter is at 3.
Apr 09 10:48:26 nixos systemd[1]: display-manager.service: Start request repeated too quickly.
Apr 09 10:48:26 nixos systemd[1]: display-manager.service: Failed with result 'exit-code'.
Apr 09 10:48:26 nixos systemd[1]: display-manager.service: Triggering OnFailure= dependencies.
Apr 09 10:48:26 nixos systemd[1]: display-manager.service: Failed to enqueue OnFailure=plymouth-quit.service job, ignoring: Unit plymouth-quit.service not found.
```

malloc · April 9, 2026, 5:44pm

At least theme configuration is loaded now:

Apr 09 10:04:26 nixos sddm[1189]: Loading theme configuration from "/run/current-system/sw/share/sddm/themes/sddm-astronaut-theme/Themes/astronaut.conf"

However this still persists despite switching to qt6 enabled theme:

Apr 09 10:04:28 nixos sddm-greeter-qt6[1527]: No shell integration named "layer-shell" found
Apr 09 10:04:28 nixos sddm-greeter-qt6[1527]: Loading shell integration failed.
Apr 09 10:04:28 nixos sddm-greeter-qt6[1527]: Attempted to load the following shells QList("layer-shell")
Apr 09 10:04:28 nixos sddm-greeter-qt6[1527]: Could not load the Qt platform plugin "wayland" in "" even though it was found.
Apr 09 10:04:28 nixos sddm-greeter-qt6[1527]: This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.
Apr 09 10:04:28 nixos systemd-coredump[1799]: Process 1527 (sddm-greeter-qt) of user 175 terminated abnormally with signal 6/ABRT, processing...
Apr 09 10:04:28 nixos systemd-coredump[1802]: Process 1527 (sddm-greeter-qt) of user 175 dumped core.
                                              Module /nix/store/36hzsmxz6yfmn5lr88rikg81cyb8373c-sddm-unwrapped-0.21.0/bin/sddm-greeter-qt6 without build-id.
                                              #12 0x00005607ce6c0c46 main (/nix/store/36hzsmxz6yfmn5lr88rikg81cyb8373c-sddm-unwrapped-0.21.0/bin/sddm-greeter-qt6 + 0x14c46)
                                              #15 0x00005607ce6c1585 _start (/nix/store/36hzsmxz6yfmn5lr88rikg81cyb8373c-sddm-unwrapped-0.21.0/bin/sddm-greeter-qt6 + 0x15585)

You could try making qt dependencies of theme available to display-manager

services.displayManager.sddm.extraPackages = [ 
  pkgs.kdePackages.qtsvg 
  pkgs.kdePackages.qtmultimedia 
  pkgs.kdePackages.qtvirtualkeyboard 
];

Also, I notice this:

Apr 09 10:04:27 nixos sddm-helper-start-wayland[1522]: Starting Wayland process "/nix/store/6j9i1w0qf0y7k6cppy4y79d6n1mw7740-kwin-6.6.3/bin/kwin_wayland --no-global-shortcuts --no-kactivities --no-lockscreen --locale1" "sddm"

You are using kwin compositor, but weston is the default [1]. Is this forced by your desktop shell or some other configuration? I wonder if changing this to weston will do anything to change your situation:

services.displayManager.sddm.wayland.compositor = "weston";

These messages raise red flags for me, but could be entirely unrelated. Would be curious to see if they persist with weston.

Apr 09 10:04:27 nixos sddm-helper-start-wayland[1522]: "Failed to gain real time thread priority (See CAP_SYS_NICE in the capabilities(7) man page). error: Operation not permitted\n"
...
Apr 09 10:04:28 nixos sddm-helper-start-wayland[1522]: "qmlRegisterType requires absolute URLs.\n"

[1] NixOS Search

biscotty · April 9, 2026, 5:57pm

That was just a try with kwin. The earlier output was with weston.

malloc · April 9, 2026, 7:27pm

looking back at the thread, I only observed log output with …kwin_wayland and one post with X11.

Might be best to follow up with upstream display manager. They might have more insight as to what your issue could be. I am reluctant to say it’s hardware issue if it was working to some degree in the past. I have sddm in combination with noctalia shell and niri on a nvidia gpu that’s ~9-10 yrs old.

The issue I had was just an outdated flake that nixpkgs maintainers had already patched [1].

[1] https://discourse.nixos.org/t/display-manager-doesnt-load/76674?u=malloc

biscotty · April 10, 2026, 2:10am

Indeed you are right. According to nixos.org weston is supposed to be the default, so I thought I was trying something new with kwin, but it turns out to actually be the default. Using weston solves the issue. I guess the “documentation” hasn’t been updated.

However, I’m still having problems loading the theme. I’ve added the dependencies as suggested. Just for the record, my stanza is

  services.displayManager.sddm = {
    enable = true;
    theme = "sddm-astronaut-theme";
    wayland.enable = true;
    wayland.compositor = "weston";
    extraPackages = [
      pkgs.sddm-astronaut
      pkgs.kdePackages.qtsvg
      pkgs.kdePackages.qtmultimedia
      pkgs.kdePackages.qtvirtualkeyboard
    ];
  };
```

The boot output of which is

❯ grep sddm <(journalctl -b)
Apr 09 20:07:47 nixos sddm[1185]: Initializing...
Apr 09 20:07:47 nixos sddm[1185]: Starting...
Apr 09 20:07:47 nixos sddm[1185]: Logind interface found
Apr 09 20:07:47 nixos sddm[1185]: Adding new display...
Apr 09 20:07:47 nixos sddm[1185]: Loaded empty theme configuration
Apr 09 20:07:47 nixos sddm[1185]: Using VT 1
Apr 09 20:07:47 nixos sddm[1185]: Display server started.
Apr 09 20:07:47 nixos sddm[1185]: Socket server starting...
Apr 09 20:07:47 nixos sddm[1185]: Socket server started.
Apr 09 20:07:47 nixos sddm[1185]: Loading theme configuration from "/run/current-system/sw/share/sddm/themes/sddm-astronaut-theme/Themes/astronaut.conf"
Apr 09 20:07:47 nixos sddm[1185]: Greeter starting...
Apr 09 20:07:47 nixos sddm-helper[1250]: [PAM] Starting...
Apr 09 20:07:47 nixos sddm-helper[1250]: [PAM] Authenticating...
Apr 09 20:07:47 nixos sddm-helper[1250]: [PAM] returning.
Apr 09 20:07:47 nixos systemd-logind[984]: New session 'c1' of user 'sddm' with class 'greeter' and type 'wayland'.
Apr 09 20:07:47 nixos (systemd)[1322]: pam_unix(systemd-user:session): session opened for user sddm(uid=175) by (uid=0)
Apr 09 20:07:47 nixos systemd-logind[984]: New session '1' of user 'sddm' with class 'manager-early' and type 'unspecified'.
Apr 09 20:07:48 nixos systemd[1322]: Cleanup lingering KCrash metadata skipped, unmet condition check ConditionPathExistsGlob=/var/lib/sddm/.cache/kcrash-metadata/*.ini
Apr 09 20:07:48 nixos systemd[1322]: Submitting pending crash events skipped, unmet condition check ConditionPathExistsGlob=/var/lib/sddm/.cache/drkonqi/sentry-envelopes/*
Apr 09 20:07:48 nixos systemd[1322]: Cleanup lingering KCrash metadata skipped, unmet condition check ConditionPathExistsGlob=/var/lib/sddm/.cache/kcrash-metadata/*.ini
Apr 09 20:07:48 nixos systemd[1]: Started Session c1 of User sddm.
Apr 09 20:07:48 nixos sddm-helper[1496]: Jumping to VT 1
Apr 09 20:07:48 nixos sddm-helper[1496]: VT mode fixed
Apr 09 20:07:48 nixos sddm[1185]: Greeter session started successfully
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: Starting Wayland process "/nix/store/jx64dzf75xhd421swdiimlpgb4kv8aml-weston-15.0.0/bin/weston --shell=kiosk -c /nix/store/zrd9ppkv2mg02zwrba0ldchvsgljs2w9-weston.ini" "sddm"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: started succesfully "/nix/store/jx64dzf75xhd421swdiimlpgb4kv8aml-weston-15.0.0/bin/weston --shell=kiosk -c /nix/store/zrd9ppkv2mg02zwrba0ldchvsgljs2w9-weston.ini"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "Date: 2026-04-09 MDT\n[20:07:48.256] weston 15.0.0\n               https://wayland.freedesktop.org\n               Bug reports to: https://gitlab.freedesktop.org/wayland/weston/issues/\n               Build: 15.0.0\n[20:07:48.256] Command line: /nix/store/jx64dzf75xhd421swdiimlpgb4kv8aml-weston-15.0.0/bin/weston --shell=kiosk -c /nix/store/zrd9ppkv2mg02zwrba0ldchvsgljs2w9-weston.ini\n[20:07:48.256] OS: Linux, 6.18.21, #1-NixOS SMP PREEMPT_DYNAMIC Thu Apr  2 11:23:33 UTC 2026, x86_64\n[20:07:48.256] Flight recorder: enabled, scopes subscribed: log\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.256] Using config file '/nix/store/zrd9ppkv2mg02zwrba0ldchvsgljs2w9-weston.ini'\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.256] Output repaint window is 7 ms maximum.\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.257] Loading module '/nix/store/jx64dzf75xhd421swdiimlpgb4kv8aml-weston-15.0.0/lib/libweston-15/drm-backend.so'\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.259] initializing drm backend\n[20:07:48.259] Trying libseat launcher...\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.259] [libseat/backend/seatd.c:64] Could not connect to socket /run/seatd.sock: No such file or directory\n[20:07:48.259] [libseat/libseat.c:76] Backend 'seatd' failed to open seat, skipping\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.265] [libseat/libseat.c:73] Seat opened with backend 'logind'\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.265] libseat: session control granted\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.266] using /dev/dri/card1\n[20:07:48.266] DRM: supports atomic modesetting\n[20:07:48.266] DRM: supports GBM modifiers\n[20:07:48.266] DRM: supports Atomic async page flip\n[20:07:48.266] DRM: supports picture aspect ratio\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.380] Loading module '/nix/store/jx64dzf75xhd421swdiimlpgb4kv8aml-weston-15.0.0/lib/libweston-15/gl-renderer.so'\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.519] Using rendering device: /dev/dri/renderD128\n[20:07:48.519] EGL version: 1.5\n[20:07:48.519] EGL vendor: Mesa Project\n[20:07:48.519] EGL client APIs: OpenGL OpenGL_ES \n[20:07:48.519] EGL features:\n               EGL Wayland extension: no\n               context priority: yes\n               buffer age: yes\n               partial update: yes\n               swap buffers with damage: no\n               configless context: yes\n               surfaceless context: yes\n               dmabuf support: modifiers\n               fence sync: yes (native, wait)\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.527] GL version: OpenGL ES 3.2 Mesa 26.0.4\n[20:07:48.527] GLSL version: OpenGL ES GLSL ES 3.20\n[20:07:48.527] GL vendor: Intel\n[20:07:48.527] GL renderer: Mesa Intel(R) Iris(R) Xe Graphics (TGL GT2)\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.539] GL ES 3.2 - renderer features:\n               read-back format: ARGB8888\n               glReadPixels supports y-flip: yes\n               glReadPixels supports PBO: yes\n               wl_shm 10 bpc formats: yes\n               wl_shm 16 bpc formats: yes\n               wl_shm half-float formats: yes\n               internal R and RG formats: yes\n               OES_EGL_image_external: yes\n               GPU timeline: yes\n               Texture immutability: yes\n               Required precision: yes\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.539] Using GL renderer\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.555] event12 - Video Bus: is tagged by udev as: Keyboard\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.555] event12 - Video Bus: device is a keyboard\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.556] event11 - Video Bus: is tagged by udev as: Keyboard\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.556] event11 - Video Bus: device is a keyboard\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.558] event6  - Power Button: is tagged by udev as: Keyboard\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.558] event6  - Power Button: device is a keyboard\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.559] event5  - Lid Switch: is tagged by udev as: Switch\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.559] event5  - Lid Switch: device is a switch device\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.561] event1  - Logitech Wireless Keyboard PID:4075: is tagged by udev as: Keyboard\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.561] event1  - Logitech Wireless Keyboard PID:4075: device is a keyboard\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.562] event2  - Logitech Wireless Mouse: is tagged by udev as: Keyboard Mouse\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.562] event2  - Logitech Wireless Mouse: device is a pointer\n[20:07:48.562] event2  - Logitech Wireless Mouse: device is a keyboard\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.577] event8  - DELL0A24:00 06CB:CDD6 Mouse: is tagged by udev as: Mouse\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.577] event8  - DELL0A24:00 06CB:CDD6 Mouse: device is a pointer\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.579] event9  - DELL0A24:00 06CB:CDD6 Touchpad: is tagged by udev as: Touchpad\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.588] event9  - DELL0A24:00 06CB:CDD6 Touchpad: device is a touchpad\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.591] event13 - sof-hda-dsp Headphone Mic: is tagged by udev as: Switch\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.593] event13 - not using input device '/dev/input/event13'\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.597] event14 - sof-hda-dsp HDMI/DP,pcm=3: is tagged by udev as: Switch\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.598] event14 - not using input device '/dev/input/event14'\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.599] event15 - sof-hda-dsp HDMI/DP,pcm=4: is tagged by udev as: Switch\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.600] event15 - not using input device '/dev/input/event15'\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.601] event16 - sof-hda-dsp HDMI/DP,pcm=5: is tagged by udev as: Switch\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.602] event16 - not using input device '/dev/input/event16'\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.603] event3  - Intel HID events: is tagged by udev as: Keyboard\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.603] event3  - Intel HID events: device is a keyboard\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.604] event7  - Intel HID 5 button array: is tagged by udev as: Keyboard\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.604] event7  - Intel HID 5 button array: device is a keyboard\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.606] event4  - Dell WMI hotkeys: is tagged by udev as: Keyboard\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.606] event4  - Dell WMI hotkeys: device is a keyboard\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.607] event0  - AT Translated Set 2 keyboard: is tagged by udev as: Keyboard\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.607] event0  - AT Translated Set 2 keyboard: device is a keyboard\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.609] event10 - PS/2 Generic Mouse: is tagged by udev as: Mouse\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.609] event10 - PS/2 Generic Mouse: device is a pointer\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.622] libinput: configuring device \"Video Bus\".\n[20:07:48.622] libinput: configuring device \"Video Bus\".\n[20:07:48.622] libinput: configuring device \"Power Button\".\n[20:07:48.622] libinput: configuring device \"Lid Switch\".\n[20:07:48.622] unknown libinput event 900\n[20:07:48.622] libinput: configuring device \"Logitech Wireless Keyboard PID:4075\".\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.622] libinput: configuring device \"Logitech Wireless Mouse\".\n[20:07:48.622]           left-handed=false\n[20:07:48.622] libinput: configuring device \"DELL0A24:00 06CB:CDD6 Mouse\".\n[20:07:48.622]           left-handed=false\n[20:07:48.622] libinput: configuring device \"DELL0A24:00 06CB:CDD6 Touchpad\".\n[20:07:48.622]           enable-tap=true.\n[20:07:48.622]           left-handed=false\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.622] libinput: configuring device \"Intel HID events\".\n[20:07:48.622] libinput: configuring device \"Intel HID 5 button array\".\n[20:07:48.622] libinput: configuring device \"Dell WMI hotkeys\".\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.622] libinput: configuring device \"AT Translated Set 2 keyboard\".\n[20:07:48.622] libinput: configuring device \"PS/2 Generic Mouse\".\n[20:07:48.622]           left-handed=false\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.622] DRM: head 'eDP-1' found, connector 342 is connected, EDID make 'BOE', model '0x097D', serial ''\n               Supported EOTF modes: SDR\n               Supported colorimetry modes: default\n               Supported VRR modes: (none), \n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.649] DRM: EDID for the following head fails conformity:\nBlock 1, CTA-861 Extension Block:\n  Audio Data Block: Audio Format Code 0x00 is reserved.\n\n[20:07:48.649] DRM: head 'HDMI-A-1' found, connector 351 is connected, EDID make 'VIZIO, Inc', model 'E371VL', serial 'LAUKHJKM00000'\n               Supported EOTF modes: SDR\n               Supported colorimetry modes: default\n               Supported VRR modes: (none), \n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.649] Registered plugin API 'weston_drm_output_api_v1' of size 40\n[20:07:48.649] Registered plugin API 'weston_drm_virtual_output_api_v2' of size 48\n[20:07:48.649] Color manager: no-op\n                 protocol support: no\n[20:07:48.649] Setting output 'eDP-1' to color AUTO format\n[20:07:48.649] Output 'eDP-1' attempts EOTF mode SDR and colorimetry mode default.\n[20:07:48.649] Output 'eDP-1' using color profile: stock sRGB color profile\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.649] Chosen EGL config details: id:  61 rgba: 8 8 8 0 buf: 24 dep:  0 stcl: 0 int: 1-1 type: win val: fix vis_id: XRGB8888 (0x34325258)\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.649] Output eDP-1 (crtc 108) video modes:\n               1920x1080@60.0, preferred, current, 151.3 MHz\n               1920x1080@48.0, 121.0 MHz\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.649] associating input device event12 with output eDP-1 (none by udev)\n[20:07:48.649] associating input device event11 with output eDP-1 (none by udev)\n[20:07:48.649] associating input device event6 with output eDP-1 (none by udev)\n[20:07:48.649] associating input device event5 with output eDP-1 (none by udev)\n[20:07:48.649] associating input device event1 with output eDP-1 (none by udev)\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.649] associating input device event2 with output eDP-1 (none by udev)\n[20:07:48.649] associating input device event8 with output eDP-1 (none by udev)\n[20:07:48.649] associating input device event9 with output eDP-1 (none by udev)\n[20:07:48.649] associating input device event3 with output eDP-1 (none by udev)\n[20:07:48.649] associating input device event7 with output eDP-1 (none by udev)\n[20:07:48.649] associating input device event4 with output eDP-1 (none by udev)\n[20:07:48.649] associating input device event0 with output eDP-1 (none by udev)\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.649] associating input device event10 with output eDP-1 (none by udev)\n[20:07:48.649] Output 'eDP-1' enabled with head(s) eDP-1\n[20:07:48.649] Setting output 'HDMI-A-1' to color AUTO format\n[20:07:48.649] Output 'HDMI-A-1' attempts EOTF mode SDR and colorimetry mode default.\n[20:07:48.649] Output 'HDMI-A-1' using color profile: stock sRGB color profile\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.649] Chosen EGL config details: id:  61 rgba: 8 8 8 0 buf: 24 dep:  0 stcl: 0 int: 1-1 type: win val: fix vis_id: XRGB8888 (0x34325258)\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.649] Output HDMI-A-1 (crtc 185) video modes:\n               1920x1080@60.0, preferred, current, 148.5 MHz\n               1920x1080@60.0 16:9, 148.5 MHz\n               1920x1080@59.9 16:9, 148.4 MHz\n               1920x1080@50.0 16:9, 148.5 MHz\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "               1920x1080@24.0 16:9, 74.2 MHz\n               1280x720@60.0, 74.2 MHz\n               1280x720@60.0 16:9, 74.2 MHz\n               1280x720@59.9 16:9, 74.2 MHz\n               1280x720@50.0 16:9, 74.2 MHz\n               1024x768@75.0, 78.8 MHz\n               1024x768@70.1, 75.0 MHz\n               1024x768@60.0, 65.0 MHz\n               800x600@75.0, 49.5 MHz\n               800x600@72.2, 50.0 MHz\n               800x600@60.3, 40.0 MHz\n               720x576@50.0 16:9, 27.0 MHz\n               720x480@60.0 16:9, 27.0 MHz\n               720x480@59.9 16:9, 27.0 MHz\n               640x480@75.0, 31.5 MHz\n               640x480@60.0 4:3, 25.2 MHz\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "               640x480@59.9, 25.2 MHz\n               640x480@59.9 4:3, 25.2 MHz\n               720x400@70.1, 28.3 MHz\n[20:07:48.649] Output 'HDMI-A-1' enabled with head(s) HDMI-A-1\n[20:07:48.649] Compositor capabilities:\n               arbitrary surface rotation: yes\n               screen capture uses y-flip: yes\n               cursor planes: yes\n               arbitrary resolutions: no\n               view mask clipping: yes\n               explicit sync: yes\n               color operations: yes\n               color representation: yes\n               presentation clock: CLOCK_MONOTONIC, id 1\n               presentation clock resolution: 0.000000001 s\n"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: Directory "/run/user/175" has changed, checking for Wayland socket
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: Found Wayland socket "/run/user/175/wayland-1"
Apr 09 20:07:48 nixos sddm-helper-start-wayland[1496]: "[20:07:48.650] Loading module '/nix/store/jx64dzf75xhd421swdiimlpgb4kv8aml-weston-15.0.0/lib/weston/kiosk-shell.so'\n"
Apr 09 20:07:48 nixos sddm-greeter-qt6[1542]: High-DPI autoscaling Enabled
Apr 09 20:07:48 nixos sddm-greeter-qt6[1542]: Reading from "/nix/store/m98ixnk4sjjhzzd40kda1lqibfgz3x6a-desktops/share/wayland-sessions/gnome-wayland.desktop"
Apr 09 20:07:48 nixos sddm-greeter-qt6[1542]: Reading from "/nix/store/m98ixnk4sjjhzzd40kda1lqibfgz3x6a-desktops/share/wayland-sessions/gnome.desktop"
Apr 09 20:07:48 nixos sddm-greeter-qt6[1542]: Reading from "/nix/store/m98ixnk4sjjhzzd40kda1lqibfgz3x6a-desktops/share/wayland-sessions/niri.desktop"
Apr 09 20:07:48 nixos sddm-greeter-qt6[1542]: Reading from "/nix/store/m98ixnk4sjjhzzd40kda1lqibfgz3x6a-desktops/share/wayland-sessions/plasma.desktop"
Apr 09 20:07:48 nixos sddm-greeter-qt6[1542]: Reading from "/nix/store/m98ixnk4sjjhzzd40kda1lqibfgz3x6a-desktops/share/xsessions/plasmax11.desktop"
Apr 09 20:07:48 nixos sddm-greeter-qt6[1542]: Loading theme configuration from "/run/current-system/sw/share/sddm/themes/sddm-astronaut-theme/Themes/astronaut.conf"
Apr 09 20:07:48 nixos sddm-greeter-qt6[1542]: Connected to the daemon.
Apr 09 20:07:48 nixos sddm[1185]: Message received from greeter: Connect
Apr 09 20:07:48 nixos sddm-greeter-qt6[1542]: Loading file:///run/current-system/sw/share/sddm/themes/sddm-astronaut-theme/Main.qml...
Apr 09 20:07:48 nixos sddm-greeter-qt6[1542]: file:///run/current-system/sw/share/sddm/themes/sddm-astronaut-theme/Main.qml:10:1: module "QtMultimedia" is not installed 
Apr 09 20:07:48 nixos sddm-greeter-qt6[1542]: file:///run/current-system/sw/share/sddm/themes/sddm-astronaut-theme/Main.qml:10:1: module "QtMultimedia" is not installed 
Apr 09 20:07:48 nixos sddm-greeter-qt6[1542]: Fallback to embedded theme
Apr 09 20:07:48 nixos sddm-greeter-qt6[1542]: file:///nix/store/36hzsmxz6yfmn5lr88rikg81cyb8373c-sddm-unwrapped-0.21.0/lib/qt-6/qml/SddmComponents/LayoutBox.qml:35:5: QML Connections: Implicitly defined onFoo properties in Connections are deprecated. Use this syntax instead: function onFoo(<arguments>) { ... }
Apr 09 20:07:48 nixos sddm-greeter-qt6[1542]: file:///nix/store/36hzsmxz6yfmn5lr88rikg81cyb8373c-sddm-unwrapped-0.21.0/lib/qt-6/qml/SddmComponents/ComboBox.qml:105:9: QML Image: Cannot open: file:///nix/store/36hzsmxz6yfmn5lr88rikg81cyb8373c-sddm-unwrapped-0.21.0/lib/qt-6/qml/SddmComponents/angle-down.png
Apr 09 20:07:49 nixos sddm-greeter-qt6[1542]: file:///nix/store/36hzsmxz6yfmn5lr88rikg81cyb8373c-sddm-unwrapped-0.21.0/lib/qt-6/qml/SddmComponents/ComboBox.qml:105:9: QML Image: Cannot open: file:///nix/store/36hzsmxz6yfmn5lr88rikg81cyb8373c-sddm-unwrapped-0.21.0/lib/qt-6/qml/SddmComponents/angle-down.png
Apr 09 20:07:49 nixos sddm-greeter-qt6[1542]: qrc:/theme/Main.qml:41:5: QML Connections: Implicitly defined onFoo properties in Connections are deprecated. Use this syntax instead: function onFoo(<arguments>) { ... }
Apr 09 20:07:49 nixos sddm-greeter-qt6[1542]: Adding view for "eDP-1" QRect(0,0 1920x1080)
Apr 09 20:07:49 nixos sddm-greeter-qt6[1542]: Loading file:///run/current-system/sw/share/sddm/themes/sddm-astronaut-theme/Main.qml...
Apr 09 20:07:49 nixos sddm-greeter-qt6[1542]: file:///run/current-system/sw/share/sddm/themes/sddm-astronaut-theme/Main.qml:10:1: module "QtMultimedia" is not installed 
Apr 09 20:07:49 nixos sddm-greeter-qt6[1542]: file:///run/current-system/sw/share/sddm/themes/sddm-astronaut-theme/Main.qml:10:1: module "QtMultimedia" is not installed 
Apr 09 20:07:49 nixos sddm-greeter-qt6[1542]: Fallback to embedded theme
Apr 09 20:07:49 nixos sddm-greeter-qt6[1542]: file:///nix/store/36hzsmxz6yfmn5lr88rikg81cyb8373c-sddm-unwrapped-0.21.0/lib/qt-6/qml/SddmComponents/LayoutBox.qml:35:5: QML Connections: Implicitly defined onFoo properties in Connections are deprecated. Use this syntax instead: function onFoo(<arguments>) { ... }
Apr 09 20:07:49 nixos sddm-greeter-qt6[1542]: file:///nix/store/36hzsmxz6yfmn5lr88rikg81cyb8373c-sddm-unwrapped-0.21.0/lib/qt-6/qml/SddmComponents/ComboBox.qml:105:9: QML Image: Cannot open: file:///nix/store/36hzsmxz6yfmn5lr88rikg81cyb8373c-sddm-unwrapped-0.21.0/lib/qt-6/qml/SddmComponents/angle-down.png
Apr 09 20:07:49 nixos sddm-greeter-qt6[1542]: file:///nix/store/36hzsmxz6yfmn5lr88rikg81cyb8373c-sddm-unwrapped-0.21.0/lib/qt-6/qml/SddmComponents/ComboBox.qml:105:9: QML Image: Cannot open: file:///nix/store/36hzsmxz6yfmn5lr88rikg81cyb8373c-sddm-unwrapped-0.21.0/lib/qt-6/qml/SddmComponents/angle-down.png
Apr 09 20:07:49 nixos sddm-greeter-qt6[1542]: qrc:/theme/Main.qml:41:5: QML Connections: Implicitly defined onFoo properties in Connections are deprecated. Use this syntax instead: function onFoo(<arguments>) { ... }
Apr 09 20:07:49 nixos sddm-greeter-qt6[1542]: Adding view for "HDMI-A-1" QRect(1920,0 1920x1080)
Apr 09 20:07:49 nixos sddm-greeter-qt6[1542]: Message received from daemon: Capabilities
Apr 09 20:07:49 nixos sddm-greeter-qt6[1542]: Message received from daemon: HostName
Apr 09 20:07:53 nixos sddm-greeter-qt6[1542]: file:///nix/store/36hzsmxz6yfmn5lr88rikg81cyb8373c-sddm-unwrapped-0.21.0/lib/qt-6/qml/SddmComponents/PictureBox.qml:106:13 Parameter "event" is not declared. Injection of parameters into signal handlers is deprecated. Use JavaScript functions with formal parameters instead.
Apr 09 20:07:54 nixos sddm-helper-start-wayland[1496]: "[20:07:54.726] unknown libinput event 900\n"
Apr 09 20:08:06 nixos sddm-greeter-qt6[1542]: Reading from "/nix/store/m98ixnk4sjjhzzd40kda1lqibfgz3x6a-desktops/share/wayland-sessions/plasma.desktop"
Apr 09 20:08:06 nixos sddm[1185]: Message received from greeter: Login
Apr 09 20:08:06 nixos sddm[1185]: Reading from "/nix/store/m98ixnk4sjjhzzd40kda1lqibfgz3x6a-desktops/share/wayland-sessions/plasma.desktop"
Apr 09 20:08:06 nixos sddm[1185]: Session "/nix/store/m98ixnk4sjjhzzd40kda1lqibfgz3x6a-desktops/share/wayland-sessions/plasma.desktop" selected, command: "/nix/store/c6krxl042rj5lhm1wvwkkr8r7wm7196m-plasma-workspace-6.6.3/libexec/plasma-dbus-run-session-if-needed /nix/store/c6krxl042rj5lhm1wvwkkr8r7wm7196m-plasma-workspace-6.6.3/bin/startplasma-wayland" for VT 2
Apr 09 20:08:06 nixos sddm-helper[1959]: [PAM] Starting...
Apr 09 20:08:06 nixos sddm-helper[1959]: [PAM] Authenticating...
Apr 09 20:08:06 nixos sddm-helper[1959]: [PAM] Preparing to converse...
Apr 09 20:08:06 nixos sddm-helper[1959]: [PAM] Conversation with 1 messages
Apr 09 20:08:06 nixos sddm-helper[1959]: pam_kwallet5(sddm:auth): pam_kwallet5: pam_sm_authenticate
Apr 09 20:08:06 nixos sddm-helper[1959]: gkr-pam: unable to locate daemon control file
Apr 09 20:08:06 nixos sddm-helper[1959]: gkr-pam: stashed password to try later in open session
Apr 09 20:08:06 nixos sddm-helper[1959]: [PAM] returning.
Apr 09 20:08:06 nixos sddm[1185]: Authentication for user  "biscotty"  successful
Apr 09 20:08:06 nixos sddm-greeter-qt6[1542]: Message received from daemon: LoginSucceeded
Apr 09 20:08:06 nixos sddm-helper[1959]: pam_kwallet5(sddm:setcred): pam_kwallet5: pam_sm_setcred
Apr 09 20:08:06 nixos sddm-helper[1959]: pam_unix(sddm:session): session opened for user biscotty(uid=1000) by (uid=0)
Apr 09 20:08:06 nixos sddm-helper-start-wayland[1496]: wayland greeter finished 0 QProcess::NormalExit
Apr 09 20:08:06 nixos sddm-helper-start-wayland[1496]: quitting helper-start-wayland
Apr 09 20:08:06 nixos sddm-helper-start-wayland[1496]: Stopping... "/nix/store/jx64dzf75xhd421swdiimlpgb4kv8aml-weston-15.0.0/bin/weston"
Apr 09 20:08:06 nixos sddm-helper-start-wayland[1496]: "[20:08:06.591] caught signal 15\n"
Apr 09 20:08:06 nixos sddm-helper-start-wayland[1496]: "[20:08:06.591] event12 - Video Bus: device removed\n"
Apr 09 20:08:06 nixos sddm-helper-start-wayland[1496]: "[20:08:06.592] event11 - Video Bus: device removed\n"
Apr 09 20:08:06 nixos sddm-helper-start-wayland[1496]: "[20:08:06.603] event6  - Power Button: device removed\n"
Apr 09 20:08:06 nixos sddm-helper-start-wayland[1496]: "[20:08:06.604] event5  - Lid Switch: device removed\n"
Apr 09 20:08:06 nixos sddm-helper-start-wayland[1496]: "[20:08:06.604] event1  - Logitech Wireless Keyboard PID:4075: device removed\n"
Apr 09 20:08:06 nixos sddm-helper-start-wayland[1496]: "[20:08:06.604] event2  - Logitech Wireless Mouse: device removed\n"
Apr 09 20:08:06 nixos sddm-helper-start-wayland[1496]: "[20:08:06.615] event8  - DELL0A24:00 06CB:CDD6 Mouse: device removed\n"
Apr 09 20:08:06 nixos sddm-helper-start-wayland[1496]: "[20:08:06.616] event9  - DELL0A24:00 06CB:CDD6 Touchpad: device removed\n"
Apr 09 20:08:06 nixos sddm-helper-start-wayland[1496]: "[20:08:06.643] event3  - Intel HID events: device removed\n"
Apr 09 20:08:06 nixos sddm-helper-start-wayland[1496]: "[20:08:06.644] event7  - Intel HID 5 button array: device removed\n"
Apr 09 20:08:06 nixos sddm-helper-start-wayland[1496]: "[20:08:06.644] event4  - Dell WMI hotkeys: device removed\n"
Apr 09 20:08:06 nixos sddm-helper-start-wayland[1496]: "[20:08:06.644] event0  - AT Translated Set 2 keyboard: device removed\n"
Apr 09 20:08:06 nixos sddm-helper-start-wayland[1496]: "[20:08:06.645] event10 - PS/2 Generic Mouse: device removed\n"
Apr 09 20:08:06 nixos sddm-helper-start-wayland[1496]: wayland compositor finished 0 QProcess::NormalExit
Apr 09 20:08:06 nixos sddm-helper[1250]: [PAM] Closing session
Apr 09 20:08:06 nixos sddm-helper[1250]: [PAM] Ended.
Apr 09 20:08:06 nixos sddm[1185]: Auth: sddm-helper exited successfully
Apr 09 20:08:06 nixos sddm[1185]: Greeter stopped. SDDM::Auth::HELPER_SUCCESS
Apr 09 20:08:06 nixos sddm-helper[1959]: pam_kwallet5(sddm:session): pam_kwallet5: pam_sm_open_session
Apr 09 20:08:06 nixos sddm-helper[2030]: pam_kwallet5: final socket path: /run/user/1000/kwallet5.socket
Apr 09 20:08:06 nixos sddm-helper[1959]: gkr-pam: gnome-keyring-daemon started properly and unlocked keyring
Apr 09 20:08:06 nixos sddm-helper[1959]: Starting Wayland user session: "/nix/store/36hzsmxz6yfmn5lr88rikg81cyb8373c-sddm-unwrapped-0.21.0/share/sddm/scripts/wayland-session" "/nix/store/c6krxl042rj5lhm1wvwkkr8r7wm7196m-plasma-workspace-6.6.3/libexec/plasma-dbus-run-session-if-needed /nix/store/c6krxl042rj5lhm1wvwkkr8r7wm7196m-plasma-workspace-6.6.3/bin/startplasma-wayland"
Apr 09 20:08:06 nixos sddm-helper[2038]: Jumping to VT 2
Apr 09 20:08:06 nixos sddm-helper[2038]: VT mode didn't need to be fixed
Apr 09 20:08:06 nixos sddm[1185]: Session started true
Apr 09 20:08:17 nixos (sd-pam)[1359]: pam_unix(systemd-user:session): session closed for user sddm
``

malloc · April 10, 2026, 2:55am


Apr 09 20:07:48 nixos sddm-greeter-qt6[1542]: file:///run/current-system/sw/share/sddm/themes/sddm-astronaut-theme/Main.qml:10:1: module "QtMultimedia" is not installed

Seems to be known issue with this particular theme:

https://github.com/NixOS/nixpkgs/issues/390251

There’s workaround documented here:

https://github.com/NixOS/nixpkgs/issues/390251#issuecomment-3092636731

https://github.com/NixOS/nixpkgs/issues/390251#issuecomment-2819842296

Seems you need to move the dependencies defined in …sddm.extraPackages = [ … ]; to environment.systemPackages. Then override theme package with your desired settings.

biscotty · April 10, 2026, 8:21pm

Wow, thanks so much. That did it! Cheers.