Default to Xorg on NVIDIA-only systems

and for https://bugs.launchpad.net/ubuntu/+source/gdm3/+bug/1969142 as well.

BTW, I think we should say "on nvidia as boot_vga systems"?

Says, Hybrid desktop (boot from intel or boot from nvidia) or nvidia only laptops or other scenarios.

Hybrid desktop boot from nvidia is needed to be considered in this case, and when we talking about chassis_type then it means the rule needs to consider to check chassis_type from dmi-table. If chassis_type is not mandatory condition, then we can prevent to make it complex.

Bug 1969142 is a duplicate of bug 1876632 so ideally please use the latter.

I think you're right about a stricter definition of "NVIDIA-only". I do mean all forms of "NVIDIA-primary". I was just trying to word the bug in a way that makes sense to normal users.

However, given that upstream gdm3 needs more work in this area I don't think it's wise to generalise the detection methods this cycle. That will take a lot more time than we have - leave it till next cycle and ensure all that work is done upstream first. We have too many patches in this area already.

I updated my 22.04 system today (with Nvidia proprietary drivers and a 3080 card). I added this file:

cat /etc/modprobe.d/nvidia-power-management.conf
options nvidia NVreg_PreserveVideoMemoryAllocations=1

Now both Wayland and suspend/resume seems to work for the first time ever. Without the above file, the system uses X11.

A fix was uploaded yesterday but it seemingly didn't make the release:

https://launchpadlibrarian.net/597672532/gdm3_42.0-1ubuntu7_source.changes

On a laptop with Nvidia + Intel GPU that works in hybrid mode (BIOS set to hybrid, nvidia-settings set to on-demand), X.Org is still considered the default. The menu on the gear icon shows "Ubuntu" and "Ubuntu on Wayland" which means X.Org is the default. This is contradictory to what the patch above says.

OS: 22.04
gdm3: 42.0-1ubuntu7.22.04.1
Nvidia driver: 525.105.17

Yes we know there's a bug in gdm3 that makes the fix unreliable on some systems. We never figured it out, but that doesn't matter so much because accidentally defaulting to Xorg is probably a better experience for Nvidia hybrid systems, in hindsight. Wayland still has poor performance if you plug an external monitor into the Nvidia GPU -> bug 1970291.

I agree, Xorg still provides the best experience with NVIDIA.