Think I found it. The new version of triple buffering in mutter 44.0 is
too aggressive at scaling back to double buffering. So that's why 22.04
and 22.10 felt faster on Pi than 23.04 does right now.
The workaround is to add this to /etc/environment:
MUTTER_DEBUG_TRIPLE_BUFFERING=always
** Tags added: triple-buffering
** Tags added: regression-release
** Changed in: mutter (Ubuntu)
Assignee: (unassigned) => Daniel van Vugt (vanvugt)
** No longer affects: linux-raspi (Ubuntu)
** Changed in: mutter (Ubuntu)
Importance: Undecided => Medium
** Changed in: mutter (Ubuntu)
Status: New => Triaged
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https://bugs.launchpad.net/bugs/2017097
Title:
[raspi] GNOME Shell runs at 30 FPS unless the CPU is being stressed
Status in mutter package in Ubuntu:
Triaged
Bug description:
On a Raspberry Pi 400, GNOME Shell runs at 30 FPS unless the CPU is
being stressed in which case it becomes a smooth 60 FPS. Seems like a
frequency scaling issue.
ProblemType: Bug
DistroRelease: Ubuntu 23.04
Package: mutter (not installed)
ProcVersionSignature: Ubuntu 6.2.0-1004.5-raspi 6.2.6
Uname: Linux 6.2.0-1004-raspi aarch64
ApportVersion: 2.26.1-0ubuntu2
Architecture: arm64
CasperMD5CheckResult: unknown
Date: Thu Apr 20 15:13:51 2023
ImageMediaBuild: 20230417
SourcePackage: mutter
UpgradeStatus: No upgrade log present (probably fresh install)
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/2017097/+subscriptions
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