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

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