That sounds like an important regression, but since this bug is closed
we will need you to open a new one by running:

  ubuntu-bug mutter

and add the tag 'regression-update'. Please also attach output from
'drm_info' to the new bug.

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https://bugs.launchpad.net/bugs/1966808

Title:
  [radeon] gnome-shell Wayland sessions fail to start on legacy Radeon
  systems (Failed to lock front buffer on /dev/dri/cardN:
  drmModeAddFB2WithModifiers failed: Invalid argument)

Status in Mutter:
  Fix Released
Status in mutter package in Ubuntu:
  Fix Released

Bug description:
  Wayland started crashing for me on upgrade to Jammy, which I'm aware
  is currently in alpha.

  gdm was crashing, and changing to lightdm addressed this issue.  If I
  select 'Ubuntu on Xorg' - I can login without problems.

  If I select Wayland instead, I just get a black screen, and I have to
  kill gnome-session from a virtual console.

  WORKAROUND:

  Add this to /etc/environment:  MUTTER_DEBUG_USE_KMS_MODIFIERS=0

  ---

  ProblemType: Bug
  DistroRelease: Ubuntu 22.04
  Package: gnome-shell 42~beta-1ubuntu3
  ProcVersionSignature: Ubuntu 5.15.0-23.23-generic 5.15.27
  Uname: Linux 5.15.0-23-generic x86_64
  ApportVersion: 2.20.11-0ubuntu79
  Architecture: amd64
  CasperMD5CheckResult: pass
  CurrentDesktop: ubuntu:GNOME
  Date: Mon Mar 28 15:23:51 2022
  DisplayManager: lightdm
  InstallationDate: Installed on 2022-03-19 (9 days ago)
  InstallationMedia: Ubuntu 22.04 LTS "Jammy Jellyfish" - Alpha amd64 (20220318)
  RelatedPackageVersions: mutter-common 42~beta-1ubuntu2
  SourcePackage: gnome-shell
  UpgradeStatus: No upgrade log present (probably fresh install)

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