** Also affects: mutter (Ubuntu Lunar)
Importance: Undecided
Status: New
** Changed in: mutter (Ubuntu Lunar)
Importance: Undecided => Medium
** Changed in: mutter (Ubuntu Lunar)
Status: New => In Progress
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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:
Fix Released
Status in mutter source package in Lunar:
In Progress
Bug description:
[ Impact ]
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.
[ Workaround ]
Add this to /etc/environment:
MUTTER_DEBUG_TRIPLE_BUFFERING=always
[ Test Plan ]
1. Log into the default (Wayland) session on a Raspberry Pi 4/400.
2. Set the display resolution to 1920x1080 60Hz.
3. Drag a window around and ensure it appears smooth (60Hz).
[ 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.
[ Original bug ]
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)
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