The issue does not occur after setting MUTTER_DEBUG_KMS_THREAD_TYPE=user. -- 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/2087879
Title: Frame rate drops when moving mouse over window Status in mutter package in Ubuntu: Incomplete Bug description: When moving the mouse cursor over a window displaying vsync'd graphics (e.g., glxgears), the frame rate drops from 60 FPS to around 40 FPS, and the animation becomes visually slower. This slowdown takes up to a few seconds to begin once the mouse movement starts, and recovers immediately when the mouse movement stops. Using mangohud, I observed that frametime fluctuates between 16 ms and 33 ms in a sawtooth pattern (see attached screenshot). I can reproduce this in a fresh install of Ubuntu 24.04 in the default Ubuntu/GNOME (Wayland) session after installing updates. I can't reproduce it in the Xorg session or other Wayland compositors. My graphics hardware is AMD Radeon RX 6600 XT. ProblemType: Bug DistroRelease: Ubuntu 24.04 Package: gnome-shell 46.0-0ubuntu6~24.04.5 ProcVersionSignature: Ubuntu 6.8.0-48.48-generic 6.8.12 Uname: Linux 6.8.0-48-generic x86_64 ApportVersion: 2.28.1-0ubuntu3.1 Architecture: amd64 CasperMD5CheckResult: pass CurrentDesktop: ubuntu:GNOME Date: Mon Nov 11 16:22:48 2024 DisplayManager: gdm3 InstallationDate: Installed on 2024-11-11 (0 days ago) InstallationMedia: Ubuntu 24.04.1 LTS "Noble Numbat" - Release amd64 (20240827.1) ProcEnviron: LANG=en_US.UTF-8 PATH=(custom, no user) SHELL=/bin/bash TERM=xterm-256color XDG_RUNTIME_DIR=<set> RelatedPackageVersions: mutter-common 46.2-1ubuntu0.24.04.2 SourcePackage: gnome-shell UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/2087879/+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
