** Description changed: [ Impact ] On the affected Ubuntu 24.04 system, fullscreen applications can run at approximately 37-55 FPS on a 75 Hz display, causing visible stutter. Mutter: 46.2-1ubuntu0.24.04.16 - [ Test Plan ] - 1. On an affected Ubuntu 24.04 GNOME Wayland system, configure the display to - 1920x1080 at approximately the panel refresh rate. + 1. Log into a Wayland session. 2. Restart GDM or log out and back in. Confirm that a new GNOME Shell process - is running. + is running. 3. Run for at least 120 seconds and record every five-second FPS report: - glxgears -fullscreen + glxgears -fullscreen - 4. Repeat from a new graphical session. Expect sustained periods where the framerate - is approximately the same as the monitor refresh rate. - + 4. Verify FPS stays near the display refresh rate and stutter/vblank + misses no longer occur. [ Where problems could occur ] - TBD + The change does not alter the actual KMS update contents, modesetting + logic, buffer selection, or page-flip handling. It only adjusts the + timing margin used to decide when to submit updates. If problems occur, + they are most likely to be performance/timing issues such as latency or + frame pacing changes, not crashes or display configuration failures. [ Other Info ] + + MR: https://salsa.debian.org/gnome-team/mutter/-/merge_requests/180 + + This is a Noble-specific workaround for Mutter 46. It is not forwarded + upstream because newer Mutter versions handle this differently with KMS-ready + timestamp tracking introduced by upstream Mutter MR !4825.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2167418 Title: [Draft][SRU] mutter: fullscreen applications run below the display refresh rate To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/2167418/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
