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https://bugs.launchpad.net/bugs/2017097

Title:
  [raspi] GNOME Shell 44.0 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:
  Fix Released

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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