This bug was fixed in the package mutter - 44.1-0ubuntu1
---------------
mutter (44.1-0ubuntu1) lunar; urgency=medium
[ Jeremy Bícha ]
* New upstream release (LP: #2020225, LP: #2012717, LP: #2013216,
LP: #2015861, LP: #2017097)
* debian/libmutter-12-0.symbols: Add new symbols
* Drop 3 patches applied in new release
[ Daniel van Vugt ]
* Update triple buffering patch for Mutter 44.1 (LP: #2017137)
-- Jeremy Bícha <jbi...@ubuntu.com> Fri, 19 May 2023 16:18:13 -0400
** Changed in: mutter (Ubuntu Lunar)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/2017137
Title:
GNOME 44.0 Xorg sessions on Intel GPUs stutter noticeably in 23.04
Status in mutter package in Ubuntu:
Fix Released
Status in mutter source package in Lunar:
Fix Released
Bug description:
[ Impact ]
Xorg sessions on Intel GPUs stutter noticeably in 23.04
Seems like a combination of:
* over-aggressive latency optimizations in the latest version of triple
buffering; and
* gnome-shell 44 being slightly less efficient at some operations like
scrolling the app grid.
[ Workaround ]
Add this to /etc/environment:
MUTTER_DEBUG_TRIPLE_BUFFERING=always
[ Test Plan ]
1. Find a machine with an Intel GPU.
2. Log into 'Ubuntu on Xorg'.
3. Press Super+A and scroll the icon right left/right. It should be
perfectly smooth like in Wayland sessions.
[ Where problems could occur ]
Triple buffering affects all frame scheduling so any mistakes can
cause high CPU usage, screen freezes and stutter. Try not to make
mistakes.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/2017137/+subscriptions
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