gdm-44 might prevent using wayland on nvidia or other settings

[pierre]

Reported by archetech on #lfs-support:

The /usr/lib/udev/rules.d/1-gdm.rules file can in some cases prevent gdm to display wayland options. This is mainly to "protect" users from (nasty) bugs in the drivers in some case (hybrid graphics with nvidia gpus, dual virtual gpus, virtual gpus with passthrough gpu, etc).

Information at:

• ​https://gitlab.gnome.org/GNOME/gdm/-/merge_requests/171
• ​https://gitlab.gnome.org/GNOME/gdm/-/issues/758
• ​https://bugzilla.redhat.com/show_bug.cgi?id=2128910
• ​https://wiki.archlinux.org/title/GDM section 4.1

Creating this ticket so that users who have a problem can get to the above information...

[pierre]

Dirty workaround:

ln -s /dev/null /etc/udev/rules.d/61-gdm.rules

But then you might be exposed to the bugs in the drivers (troubles with suspend/resume, or hybrid graphics slowing down to a "slideshow" frame rate).

[Douglas R. Reno]

One classic example of this is the Nouveau kernel crashes that occur with GT 730+ GPUs, which only happen when running GNOME in Wayland. I've reported it upstream a couple times but the problem is in the kernel and has not been resolved yet.

For now you'll notice that the GTK-4 tests sometimes cause hard system lockups when running under Wayland on NVIDIA GPUs as well, even if it's in another DE (such as Plasma).

[Xi Ruoyao]

I guess we should just document the issue and let the user decide what to do.

[Douglas R. Reno]

The best approach here is probably to add a configuration note to GDM informing users about the problem

[Bruce Dubbs]

Milestone renamed

[Douglas R. Reno]

Fixed at 4830ec33ce7398980f26c0fca387a60d84158160