Upstream has already "fixed" it by reverting the change in a later
release:

https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3030

Although this seems to be because they were waiting on a fix in Xwayland
version 23.1.0 which Ubuntu 22.04 doesn't have yet. It looks like the
downside they were trying to avoid was:

> sending modifiers to clients prevents direct scanout for DRI3 clients
via Xwayland

so it was just to make full screen gaming performance better. If you can
live without that optimization then you should keep
MUTTER_DEBUG_SEND_KMS_MODIFIERS=1. Starting in 23.10 we have the best of
both worlds so you won't need to choose anymore.


** Changed in: mutter (Ubuntu)
   Importance: Undecided => Medium

** Changed in: mutter (Ubuntu)
       Status: Incomplete => Triaged

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https://bugs.launchpad.net/bugs/2026886

Title:
  [amdgpu] google chrome hardware acceleration broken on 42.9-0ubuntu2

Status in mutter package in Ubuntu:
  Triaged

Bug description:
  This morning, I upgraded gnome-shell and gnome-shell-common from
  42.5-0ubuntu1 to 42.9-0ubuntu2, and I noticed that chrome no longer
  renders properly. Notice the missing image header on the Ubuntu
  website and the garbled right click menu here:

  https://i.imgur.com/BPnqfVG.png

  I downgraded gnome-shell and gnome-shell-common version to
  42.0-2ubuntu1, restarted gnome, and the rendering issues went away:

  https://i.imgur.com/CzEPgqY.png

  I upgraded gnome-shell and gnome-shell-common again to the latest and
  the rendering issues came back. Going to chrome://settings/system and
  disabling hardware acceleration fixes the rendering issues (but now I
  don't  have hardware acceleration).

  I'm running the latest stable version of chrome which was released a
  few weeks ago: 114.0.5735.198

  ---

  $ lsb_release -rd
  Description:  Ubuntu 22.04.2 LTS
  Release:      22.04

  $ apt-cache policy gnome-shell
  gnome-shell:
    Installed: 42.9-0ubuntu2
    Candidate: 42.9-0ubuntu2
    Version table:
   *** 42.9-0ubuntu2 500 (phased 40%)
          500 http://us.archive.ubuntu.com/ubuntu jammy-updates/main amd64 
Packages
          100 /var/lib/dpkg/status
       42.0-2ubuntu1 500
          500 http://us.archive.ubuntu.com/ubuntu jammy/main amd64 Packages

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