Periodic black frames and stutter [Failed to post KMS update: drmModeAddFB does not support format 'AR24' (0x34325241)]

[Dominic Parry]

Every so often, the desktop will go black and then re appear on Ubuntu 22.10 Wayland Session which should not be occurring (this does not happen on 22.04.) Note that only the cursor can be seen.

Reporting this before release so that it can be patched for (at least) the RasPi.

ProblemType: Bug
DistroRelease: Ubuntu 22.10
Package: gnome-shell 43~beta-1ubuntu2
ProcVersionSignature: Ubuntu 5.19.0-1001.3-raspi 5.19.0-rc8
Uname: Linux 5.19.0-1001-raspi aarch64
NonfreeKernelModules: zfs zunicode zcommon znvpair zavl icp
ApportVersion: 2.23.0-0ubuntu1
Architecture: arm64
CasperMD5CheckResult: unknown
CurrentDesktop: ubuntu:GNOME
Date: Tue Sep 6 16:10:37 2022
DisplayManager: gdm3
ImageMediaBuild: 20220826
RelatedPackageVersions: mutter-common 43~beta-3ubuntu2
SourcePackage: gnome-shell
UpgradeStatus: No upgrade log present (probably fresh install)

[Daniel van Vugt (vanvugt)]

Thanks for the bug report.

The attached log seems to explain the problem perfectly:

[10185.511277] rpi4b gnome-shell[2551]: Failed to post KMS update: drmModeAddFB does not support format 'AR24' (0x34325241)
[10185.547140] rpi4b gnome-shell[2551]: Page flip discarded: drmModeAddFB does not support format 'AR24' (0x34325241)
[10185.547707] rpi4b gnome-shell[2551]: Failed to post KMS update: drmModeAddFB does not support format 'AR24' (0x34325241)
[10185.548506] rpi4b gnome-shell[2551]: Page flip discarded: drmModeAddFB does not support format 'AR24' (0x34325241)
[10185.549013] rpi4b gnome-shell[2551]: Failed to post KMS update: drmModeAddFB does not support format 'AR24' (0x34325241)
[10185.549464] rpi4b gnome-shell[2551]: Page flip discarded: drmModeAddFB does not support format 'AR24' (0x34325241)
[10185.558077] rpi4b gnome-shell[2551]: Failed to post KMS update: drmModeAddFB does not support format 'AR24' (0x34325241)

[Daniel van Vugt (vanvugt)]

The reason I call this Medium and not Low is because the bug is preventing cursor usage during full screen apps. It's the cursor updates that are causing the full screen updates to fail and flicker.

[Daniel van Vugt (vanvugt)]

Fix proposed: https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2658

[Daniel van Vugt (vanvugt)]

Added a mesa task because all debugging so far points to a bug in Mesa (vc4 and panfrost):

https://gitlab.gnome.org/GNOME/mutter/-/issues/2379

[Daniel van Vugt (vanvugt)]

I don't want to be waiting indefinitely for Mesa to get fixed (which is GNOME's position right now) so have proposed a patch for Ubuntu: https://salsa.debian.org/gnome-team/mutter/-/merge_requests/86

[Daniel van Vugt (vanvugt)]

Likely (the proper) fix committed to mesa in:
https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/20397

[Daniel van Vugt (vanvugt)]

Workaround committed to mutter for the next lunar update, whenever that may be.

https://salsa.debian.org/gnome-team/mutter/-/commit/d615363fa9

[Launchpad Janitor (janitor)]

This bug was fixed in the package mutter - 43.2-5ubuntu1

---------------
mutter (43.2-5ubuntu1) lunar; urgency=medium

  * Merge with Debian. Remaining change:
    - Add x11-Add-support-for-fractional-scaling-using-Randr.patch

mutter (43.2-5) unstable; urgency=medium

  [ Daniel van Vugt ]
  * Update Support-Dynamic-triple-double-buffering.patch.
    Fix tearing on monitors attached to secondary GPUs (LP: #1999216)
  * Add patch for cursor-renderer-native to workaround broken arm64 drivers.
    By forcing cursors to use dumb buffers. At least until Mesa gets fixed
    for panfrost, vc4, v3d... (LP: #1988859)

 -- Jeremy Bicha <email address hidden> Mon, 23 Jan 2023 11:44:41 -0500

[Launchpad Janitor (janitor)]

This bug was fixed in the package mesa - 22.3.6-1ubuntu1

---------------
mesa (22.3.6-1ubuntu1) lunar; urgency=medium

  * Merge from Debian.
  * rules: Drop i386 from RUSTICL_ARCHS.

mesa (22.3.6-1) unstable; urgency=medium

  * New upstream release. (Closes: #1029731)

mesa (22.3.5-1) unstable; urgency=medium

  * New upstream release.

 -- Timo Aaltonen <email address hidden> Tue, 28 Feb 2023 21:57:55 +0200