Public bug reported: [ Impact ]
Debug mode MUTTER_DEBUG_TRIPLE_BUFFERING=always doesn't result in triple buffering being used anymore. [ Test Plan ] 1. Add MUTTER_DEBUG_TRIPLE_BUFFERING=always to /etc/environment 2. Reboot. 3. Log into a Wayland session. 4. Open a Terminal window and drag it in circles with the mouse. 5. Verify there is a slight lag between the mouse pointer position and the window position. This means it's always triple buffering (or you accidentally logged into a Xorg session). [ Where problems could occur ] Anywhere in frame scheduling, including screen freezes and stutter. [ Other Info ] This regression occurred in 46.0 as a result of jbicha and myself working a little too independently. Jeremy identified that the upstream branch supported 46 and cherry-picked that for the Noble release, while I was still working on creating a stable maintenance branch for 46 in https://gitlab.gnome.org/Community/Ubuntu/mutter/-/tree/triple- buffering-v4-46 Fortunately it's very low priority and nobody has actually reported it. ** Affects: mutter (Ubuntu) Importance: Low Assignee: Jeremy Bícha (jbicha) Status: Fix Released ** Affects: mutter (Ubuntu Noble) Importance: Low Assignee: Daniel van Vugt (vanvugt) Status: Triaged ** Affects: mutter (Ubuntu Oracular) Importance: Low Assignee: Jeremy Bícha (jbicha) Status: Fix Released ** Tags: noble oracular regression-release triple-buffering ** Also affects: mutter (Ubuntu Noble) Importance: Undecided Status: New ** Also affects: mutter (Ubuntu Oracular) Importance: Low Status: Fix Released ** Changed in: mutter (Ubuntu Noble) Assignee: (unassigned) => Daniel van Vugt (vanvugt) ** Changed in: mutter (Ubuntu Noble) Milestone: None => ubuntu-24.04.1 ** Changed in: mutter (Ubuntu Noble) Importance: Undecided => Low ** Changed in: mutter (Ubuntu Oracular) Milestone: None => ubuntu-24.10 ** Changed in: mutter (Ubuntu Oracular) Assignee: (unassigned) => Jeremy Bícha (jbicha) ** Changed in: mutter (Ubuntu Noble) Status: New => Triaged -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2070437 Title: Debug mode MUTTER_DEBUG_TRIPLE_BUFFERING=always doesn't work anymore To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/2070437/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
