This bug was fixed in the package mutter - 45.2-0ubuntu2~really45.0
---------------
mutter (45.2-0ubuntu2~really45.0) mantic; urgency=medium
* Roll back to address regression LP: #2046360.
- Full revert to mutter 45.0-3ubuntu3.1, with revert implemented under
debian/patches to avoid having to keep around confusing version numbers
for very long.
- mutter 45.2 introduces new library symbols vs 45.0 but no packages
have picked up dependencies on these symbols yet via rebuilds, and all
binary packages built from mutter source have a strict versioned
dependency on the library package; so a straight revert of the symbols
file is possible without the need to add any additional Breaks.
-- Steve Langasek <steve.langa...@ubuntu.com> Sun, 17 Dec 2023
19:44:15 -0800
** Changed in: mutter (Ubuntu Mantic)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/2046360
Title:
Heavy stuttering in Firefox with mutter 45.1/45.2
Status in mutter package in Ubuntu:
Fix Released
Status in mutter source package in Mantic:
Fix Released
Bug description:
[ Impact ]
There is heavy stuttering visible in Firefox with mutter 45.1/45.2
when kinetic scrolling a non-animated web page with a touchpad. This
is a regression introduced upstream in mutter 45.1 (8f27ebf8).
[ Test Plan ]
0. Find a laptop with a touchpad.
1. Open a simple web page like a Wikipedia page in Firefox.
2. Use two fingers on the touchpad to fling it so it continues scrolling.
Expect: The scrolling proceeds and slows perfectly smoothly.
[ Where problems could occur ]
Anywhere in frame scheduling (visual smoothness), since that is the
code affected.
[ Other Info ]
The bug was introduced upstream in 45.1 by
https://gitlab.gnome.org/GNOME/mutter/-/commit/8f27ebf87eee6057992a90560d4118ab7bdf138d
but since it only hurts the triple buffering patch, that's where it
has been fixed:
https://gitlab.gnome.org/Community/Ubuntu/mutter/-/commit/0b896518b2028d9c4d6ea44806d093fd33793689
https://gitlab.gnome.org/Community/Ubuntu/mutter/-/commits/triple-buffering-v4-45
[ Workaround ]
In /etc/environment:
MUTTER_DEBUG_TRIPLE_BUFFERING=always
or "never" also works. Just not "auto" because the bug is in auto mode
(the default).
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/2046360/+subscriptions
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