Public bug reported:
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)
** Affects: gnome-shell (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug noble wayland-session
** Attachment added: "glxgears.png"
https://bugs.launchpad.net/bugs/2087879/+attachment/5836517/+files/glxgears.png
** Description changed:
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>
+ 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)
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https://bugs.launchpad.net/bugs/2087879
Title:
Frame rate drops when moving mouse over window
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