I’ve tried using feh to set the wallpaper, and the services.xserver.desktopManager.wallpaper.mode ~/.background-image as well, but as soon as I login a black screen gets placed over top of the wallpaper.
Any ideas?
Here’s a slow motion video of the issue https://www.youtube.com/watch?v=rBAsr8vG8PA
Thanks
I’ve never used lxqt, but given the symptoms I’d assume it’s a DE that renders its own desktop background over the X server one. This has advantages like better control over cursors, wallpaper scaling, special animations and other effects. Plasma and GNOME do the same thing. feh is mostly for window managers.
It might also just set again it after lxqt starts, overriding the background set by feh. Can you try manually setting the background using feh in a terminal once lxqt is already running?
If that doesn’t solve it, using feh won’t work with these DEs, use their native features for changing the wallpaper.
I’ve tried setting the wallpaper with feh in the terminal, but the black screen still remains, I posted the same question on reddit, and someone said they don’t experience this on fedora lxqt, so I guessed it might be something different that nixos does.
I downloaded a fedora 39 lxqt ISO and ran that, I then uninstalled pcmanfm-qt, logged out, then logged in, and setting the wallpaper worked just fine using feh, so it must be a nixos issue.
What does your lxqt config look like, and specifically, how did you uninstall pcmanfm-lxqt (on NixOS)?
Do you mean the lxqt part in my configuration.nix? there appears to be no way of excluding pcmanfm-qt when you enable lxqt, so I created a custom session and just listed all the lxqt parts that I wanted under system packages, this is my custom session
services.xserver.displayManager.session = [
{
manage = “desktop”;
name = “mylxqt”;
start = “startlxqt”;
}
];
Well, that’s probably why your background is black then; pcmanfm-qt is still being rendered as a window on top of the Xorg backdrop and has no background set. It’s like you’re running fedora and not uninstalling pcmanfm-qt. Maybe you can confirm this with ps aux.
If you built the lxqt env yourself, your env is broken, not the NixOS module.
There is environment.lxqt.excludePackages, but it seems to only work on optional packages, and this one is in the “core” ones: https://github.com/NixOS/nixpkgs/blob/0b3d618173114c64ab666f557504d6982665d328/pkgs/desktops/lxqt/default.nix#L85
You’d probably need to remove this with an overlay somehow, maybe something like this:
nixpkgs.overlays = [(final: prev: {
lxqt = lxqt.overrideAttrs (old: {
passthru = old.passthru // {
corePackages = pkgs.utils.removePackagesByName [old.corePackages.pcmanfm-qt] old.passthru.corePackages;
};
});
})];
That said, I have no idea how the lxqt package/modules work beyond some superficial reading into it, so that likely won’t work. Afaict this simply is not a supported workflow currently. You can try to hack around it after reading through the code yourself (probably need to start by finding out what pkgs.lxqt refers to in all-packages.nix), or just use an lxqt theme to set your background instead.
ps aux doesn’t appear to show pcmanfm-qt, I also experimented by using ~/.xsession where the only apps I executed on login were lxqt-panel and kwin_x11, and I still got the black screen, I then opened a terminal and killed lxqt-panel but the black screen was still there, so it doesn’t seem to be lxqt related as far as I can tell.
Thanks
1 root 0:01 /run/current-system/systemd/lib/systemd/systemd
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250540 gareth 0:00 ps aux
I figured out where the black screen is coming from, its coming from kwin_x11, I tried openbox and there was no black screen, the problem is I like kwin, I guess it appears to be related to kscreen_backend
I’ve found out what the issue was, running kwin with compositing enabled seems to create a black screen, disabling compositing fixes it, but you obviously don’t have compositing, so as a work around I’ve installed picom-next.