Default to Xorg on NVIDIA-only systems

[Daniel van Vugt]

NVIDIA has requested that we default to Xorg on NVIDIA-only systems.
(@kenvandine was advised so)

One possible reason cited was:
https://gitlab.freedesktop.org/xorg/xserver/-/issues/1317
but if anyone finds additional reasons then please add them here.

But good news: This is only for NVIDIA desktops. Hybrid laptops where Intel/AMD is the primary GPU are unaffected and should default to Wayland (after bug 1968929 is resolved).

[jeremyszu (os369510)]

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.

[Daniel van Vugt (vanvugt)]

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.

[Henrik Harmsen (henrik-harmsen)]

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.

[Daniel van Vugt (vanvugt)]

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

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