Hello,
I have a Thinkpad P14s with a Synaptics TM3471-020 touchpad, which
doesn’t work well with NixOS. Specifically, the left button click is
not detected (the left button tap is detected correctly).
In my /etc/nixos/configuration.nix I have:
services.xserver = {
enable = true;
layout = "us";
xkbOptions = "eurosign:e";
# Gnome
displayManager.gdm.enable = true;
desktopManager.gnome3.enable = true;
videoDrivers = [ "modesetting" "nvidia" ];
libinput.enable = true;
# Tried to configure the touchpad here, but this crashes xserver:
# inputClassSections = [''
# Identifier "Synaptics TM3471-020"
# Driver "libinput"
# MatchIsTouchpad "on"
# Device "/dev/input/event*"
# Option "AccelProfille" "adaptive,flat"
# Option "ClickMethod" "buttonareas,clickfinger"
# Option "DisableWhileTyping" "true"
# Option "HorizontalScrolling" "true"
# Option "LeftHanded" "false"
# Option "MiddleEmulation" "false"
# Option "NaturalScrolling" "false"
# Option "ScrollMethod" "twofinger,edge"
# Option "SendEventsMode" "enabled"
# Option "Tapping" "true"
# Option "TappingDrag" "true"
# ''];
};
The touchpad seems to be correctly recognized by Xorg on boot:
# journalctl -b
...
(II) config/udev: Adding input device Synaptics TM3471-020 (/dev/input/event6)
(**) Synaptics TM3471-020: Applying InputClass "evdev touchpad catchall"
(**) Synaptics TM3471-020: Applying InputClass "libinput touchpad catchall"
(**) Synaptics TM3471-020: Applying InputClass "libinput touchpad configuration"
(II) Using input driver 'libinput' for 'Synaptics TM3471-020'
(II) systemd-logind: got fd for /dev/input/event6 13:70 fd 42 paused 0
(**) Synaptics TM3471-020: always reports core events
(**) Option "Device" "/dev/input/event6"
(**) Option "_source" "server/udev"
(II) event6 - Synaptics TM3471-020: is tagged by udev as: Touchpad
(II) event6 - Synaptics TM3471-020: device is a touchpad
(II) event6 - Synaptics TM3471-020: device removed
(**) Option "Tapping" "on"
(**) Option "TappingDragLock" "on"
(**) Option "AccelProfile" "adaptive"
(**) Option "NaturalScrolling" "off"
(**) Option "SendEventsMode" "enabled"
(**) Option "LeftHanded" "off"
(**) Option "ScrollMethod" "twofinger"
(**) Option "DisableWhileTyping" "off"
(**) Option "HorizontalScrolling" "on"
(**) Option "config_info" "udev:/sys/devices/rmi4-00/input/input8/event6"
(II) XINPUT: Adding extended input device "Synaptics TM3471-020" (type: TOUCHPAD, id 15)
(**) Option "AccelerationScheme" "none"
(**) Synaptics TM3471-020: (accel) selected scheme none/0
(**) Synaptics TM3471-020: (accel) acceleration factor: 2.000
(**) Synaptics TM3471-020: (accel) acceleration threshold: 4
(II) event6 - Synaptics TM3471-020: is tagged by udev as: Touchpad
(II) event6 - Synaptics TM3471-020: device is a touchpad
...
# libinput list-devices
...
Device: Synaptics TM3471-020
Kernel: /dev/input/event6
Group: 9
Seat: seat0, default
Size: 97x65mm
Capabilities: pointer gesture
Tap-to-click: enabled
Tap-and-drag: enabled
Tap drag lock: disabled
Left-handed: disabled
Nat.scrolling: disabled
Middle emulation: n/a
Calibration: n/a
Scroll methods: *two-finger edge
Click methods: none
Disable-w-typing: enabled
Accel profiles: flat *adaptive
Rotation: n/a
...
$ xinput list
⎡ Virtual core pointer id=2 [master pointer (3)]
⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)]
⎜ ↳ Synaptics TM3471-020 id=15 [slave pointer (2)]
⎜ ↳ TPPS/2 Elan TrackPoint id=16 [slave pointer (2)]
⎣ Virtual core keyboard id=3 [master keyboard (2)]
↳ Virtual core XTEST keyboard id=5 [slave keyboard (3)]
↳ Power Button id=6 [slave keyboard (3)]
↳ Video Bus id=7 [slave keyboard (3)]
↳ Video Bus id=8 [slave keyboard (3)]
↳ Sleep Button id=9 [slave keyboard (3)]
↳ Intel HID events id=12 [slave keyboard (3)]
↳ AT Translated Set 2 keyboard id=13 [slave keyboard (3)]
↳ ThinkPad Extra Buttons id=14 [slave keyboard (3)]
↳ Integrated Camera: Integrated I id=11 [slave keyboard (3)]
↳ Integrated Camera: Integrated C id=10 [slave keyboard (3)]
$ sudo xinput list-props 15
Device 'Synaptics TM3471-020':
Device Enabled (187): 1
Coordinate Transformation Matrix (189): 1.000000, 0.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000
libinput Tapping Enabled (324): 1
libinput Tapping Enabled Default (325): 1
libinput Tapping Drag Enabled (326): 1
libinput Tapping Drag Enabled Default (327): 1
libinput Tapping Drag Lock Enabled (328): 0
libinput Tapping Drag Lock Enabled Default (329): 0
libinput Tapping Button Mapping Enabled (330): 1, 0
libinput Tapping Button Mapping Default (331): 1, 0
libinput Natural Scrolling Enabled (332): 0
libinput Natural Scrolling Enabled Default (333): 0
libinput Disable While Typing Enabled (334): 1
libinput Disable While Typing Enabled Default (335): 1
libinput Scroll Methods Available (336): 1, 1, 0
libinput Scroll Method Enabled (337): 1, 0, 0
libinput Scroll Method Enabled Default (338): 1, 0, 0
libinput Accel Speed (339): 0.235294
libinput Accel Speed Default (340): 0.000000
libinput Accel Profiles Available (341): 1, 1
libinput Accel Profile Enabled (342): 1, 0
libinput Accel Profile Enabled Default (343): 1, 0
libinput Left Handed Enabled (344): 0
libinput Left Handed Enabled Default (345): 0
libinput Send Events Modes Available (309): 1, 1
libinput Send Events Mode Enabled (310): 0, 0
libinput Send Events Mode Enabled Default (311): 0, 0
Device Node (312): "/dev/input/event6"
Device Product ID (313): 1739, 0
libinput Drag Lock Buttons (346): <no items>
libinput Horizontal Scroll Enabled (347): 1
I have an Archlinux install on the same laptop, where the touchpad
works out of the box. The libinput list-devices command in
particular shows Click methods: *button-area clickfinger. I think
this is what’s missing on NixOS:
# libinput list-devices
...
Device: Synaptics TM3471-020
Kernel: /dev/input/event9
Group: 9
Seat: seat0, default
Size: 97x65mm
Capabilities: pointer gesture
Tap-to-click: disabled
Tap-and-drag: enabled
Tap drag lock: disabled
Left-handed: disabled
Nat.scrolling: disabled
Middle emulation: disabled
Calibration: n/a
Scroll methods: *two-finger edge
Click methods: *button-areas clickfinger
Disable-w-typing: enabled
Accel profiles: flat *adaptive
Rotation: n/a
Here is the diff between Archlinux (red) and NixOS (green):
diff --git a/libinput-list-devices-arch b/libinput-list-devices-nixos
index ce2b03b..3fc07fb 100644
--- a/libinput-list-devices-arch
+++ b/libinput-list-devices-nixos
@@ -1,18 +1,18 @@
Device: Synaptics TM3471-020
-Kernel: /dev/input/event9
+Kernel: /dev/input/event6
Group: 9
Seat: seat0, default
Size: 97x65mm
Capabilities: pointer gesture
-Tap-to-click: disabled
+Tap-to-click: enabled
Tap-and-drag: enabled
Tap drag lock: disabled
Left-handed: disabled
Nat.scrolling: disabled
-Middle emulation: disabled
+Middle emulation: n/a
Calibration: n/a
Scroll methods: *two-finger edge
-Click methods: *button-areas clickfinger
+Click methods: none
Disable-w-typing: enabled
Accel profiles: flat *adaptive
Rotation: n/a
\ No newline at end of file
Also, on Archlinux, xinput list-props shows three extra properties:
libinput Click Methods Available (337): 1, 1
libinput Click Method Enabled (338): 0, 1
libinput Click Method Enabled Default (339): 1, 0
For reference, on NixOS:
$ uname -a
Linux thinpad-p14s 5.11.9 #1-NixOS SMP Wed Mar 24 10:54:19 UTC 2021 x86_64 GNU/Linux
$ libinput --version
1.16.4
On Archlinux (note that the libinput version is different):
$ uname -a
Linux thinkpad-p14s 5.11.11-arch1-1 #1 SMP PREEMPT Tue, 30 Mar 2021 14:10:17 +0000 x86_64 GNU/Linux
$ libinput --version
1.17.1