** Description changed: + [ 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)
-- You received this bug notification because you are a member of Desktop Packages, which is subscribed to mutter in Ubuntu. 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: [ 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) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/2017097/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
