https://bugs.kde.org/show_bug.cgi?id=512289
Bug ID: 512289
Summary: Kernel 6.18.0, performance degradation and atomic
commit failed: Device or resource busy
Classification: Plasma
Product: kwin
Version First 6.5.2
Reported In:
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
SUMMARY
I'm trying out a 6.18.0-rc.5/6 kernel and I see performance degradation in
Plasma, there is a lag for mouse movement, specifically when entering and
leaving Firefox (145.0). I can see a block of warning in the log when it
happens:
```
...
Nov 18 12:40:10 kwin_wayland[3283]: atomic commit failed: Device or resource
busy
Nov 18 12:40:18 kwin_wayland[3283]: atomic commit failed: Device or resource
busy
...
```
STEPS TO REPRODUCE
1. Install 6.18.0-0.rc6.51.fc44.x86_64 kernel
2. Boot into new kernel
3. Launch Firefox
4. Try opening several tabs and move cursor
OBSERVED RESULT
Cursor movement lags, especially when entering and leaving Firefox window
EXPECTED RESULT
No change in performance
SOFTWARE/OS VERSIONS
Operating System: Fedora Linux 43
KDE Plasma Version: 6.5.2
KDE Frameworks Version: 6.20.0
Qt Version: 6.10.0
Kernel Version: 6.18.0-0.rc6.51.fc44.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 32 × AMD Ryzen 9 9950X3D 16-Core Processor
Memory: 64 GiB of RAM (60.4 GiB usable)
Graphics Processor 1: AMD Radeon RX 7900 XTX
Graphics Processor 2: AMD Ryzen 9 9950X3D 16-Core Processor
ADDITIONAL INFORMATION
The issue does not reproduce on current 6.17.x kernel branch, nothing else
changes between affected and non-affected boot. Main reason I'm testing 6.18.0
kernel is to test the fix for
https://gitlab.freedesktop.org/drm/amd/-/issues/4458 which is fixed by
https://lore.kernel.org/amd-gfx/[email protected]/
and I'm wondering if the said fix is causing the lag.
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