Comment 0 for bug 1969447

The current /lib/udev/rules.d/61-gdm.rules has a broken rule for detecting the presence of NVIDIA_PRESERVE_VIDEO_MEMORY_ALLOCATIONS=1.

This issue can be seen by adding a file /etc/modprobe.d/nvidia-power-management.conf containing the line...

options nvidia NVreg_PreserveVideoMemoryAllocations=1

and then rebooting. Since manually executing the test used in /lib/udev/rules.d/61-gdm.rules as...

/bin/sh -c "sed -e 's/: /=/g' -e 's/\([^[:upper:]]\)\([[:upper:]]\)/\1_\2/g' -e 's/[[:lower:]]/\U&/g' -e 's/^/NVIDIA_/' /proc/driver/nvidia/params"

produces the desired...

NVIDIA_PRESERVE_VIDEO_MEMORY_ALLOCATIONS=1

for the actual test in /lib/udev/rules.d/61-gdm.rules of...

IMPORT{program}="/bin/sh -c \"sed -e 's/: /=/g' -e 's/\([^[:upper:]]\)\([[:upper:]]\)/\1_\2/g' -e 's/[[:lower:]]/\U&/g' -e 's/^/NVIDIA_/' /proc/driver/nvidia/params\""
ENV{NVIDIA_PRESERVE_VIDEO_MEMORY_ALLOCATIONS}!="1", GOTO="gdm_disable_wayland"

However, this test still is treated as failing as seen by the absence of Wayland on Nvidia at that point. Currently, the only workaround is to disable this particular test.

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: gdm3 42.0-1ubuntu6
ProcVersionSignature: Ubuntu 5.15.0-27.28-generic 5.15.30
Uname: Linux 5.15.0-27-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu82
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Tue Apr 19 05:20:49 2022
InstallationDate: Installed on 2022-03-31 (18 days ago)
InstallationMedia: Ubuntu 22.04 LTS "Jammy Jellyfish" - Alpha amd64 (20220326)
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: gdm3
UpgradeStatus: No upgrade log present (probably fresh install)
mtime.conffile..etc.gdm3.custom.conf: 2022-04-01T05:39:42.178574