The backported input thread patches mainly laid a foundation to solve
this issue. Mutter still needs more work to take advantage of the new
input thread. That is why there isn't an improvement in GNOME 40.
This is described here: https://blogs.gnome.org/shell-dev/2021/01/21
New upstream MR that might help:
https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1915
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https://bugs.launchpad.net/bugs/1690719
Title:
Mouse pointer randomly
Public bug reported:
With 1.14.3 the background portal creates a broken autostart file (it
sends an incorrectly quoted app ID to implementations). This means apps
like EasyEffects or Pika Backup cannot rely on the background portal to
create a working autostart file. Please update to
