I'm setting the importance to Critical per #6 at https://wiki.ubuntu.com/StableReleaseUpdates#Procedure
** Changed in: mutter (Ubuntu Jammy) Importance: High => Critical -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-intel-iotg in Ubuntu. https://bugs.launchpad.net/bugs/2026887 Title: gnome-shell 42.9 Wayland sessions fail to start on Intel Alder Lake running 5.15 kernels (Failed to lock front buffer on /dev/dri/cardN: drmModeAddFB2WithModifiers failed: Invalid argument) Status in linux package in Ubuntu: Fix Released Status in linux-intel-iotg package in Ubuntu: Confirmed Status in mutter package in Ubuntu: Invalid Status in mutter source package in Jammy: In Progress Status in mutter source package in Kinetic: Invalid Status in mutter source package in Lunar: Invalid Status in mutter source package in Mantic: Invalid Bug description: [ Impact ] gnome-shell/mutter 42.9 fails to start (black screen) on Intel Alder Lake systems running older kernels such as 5.15. [ Test Plan ] Try to log into gnome-shell. Verify there is a picture on the screen. [ Where problems could occur ] The offending code change relates to Intel-specific chip IDs so the change is limited to Intel systems. Although affected Intel systems worked perfectly before the change so we don't expect any problems in reverting the change. In theory the worst case is limited to more problems like that described in Impact above. [ Workaround ] Add MUTTER_DEBUG_USE_KMS_MODIFIERS=0 to /etc/environment [ Other Info ] The log messages relating to this bug are: iul 11 19:00:11 MY-PC gnome-shell[1040]: Failed to lock front buffer on /dev/dri/card0: drmModeAddFB2WithModifiers failed: Invalid argument iul 11 19:00:11 MY-PC gnome-shell[1040]: Failed to lock front buffer on /dev/dri/card0: drmModeAddFB2WithModifiers failed: Invalid argument iul 11 19:00:11 MY-PC gnome-shell[1040]: Failed to lock front buffer on /dev/dri/card0: drmModeAddFB2WithModifiers failed: Invalid argument iul 11 19:00:11 MY-PC gnome-shell[1040]: Failed to lock front buffer on /dev/dri/card0: drmModeAddFB2WithModifiers failed: Invalid argument ... For kinetic: The bug never existed in mutter 43.0 (it was introduced in 43.2) and was already fixed in the kernel anyway. For lunar and later: The bug was already fixed in the kernel. You would only ever encounter it in theory if you downgrade the kernel. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2026887/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
