https://bugs.kde.org/show_bug.cgi?id=500754
Bug ID: 500754
Summary: Plasma 6: Half the FPS with atomic mode setting
(again)
Classification: Plasma
Product: kwin
Version: 6.2.5
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: platform-drm
Assignee: kwin-bugs-n...@kde.org
Reporter: pe...@elementw.net
Target Milestone: ---
Created attachment 178884
--> https://bugs.kde.org/attachment.cgi?id=178884&action=edit
kwin info
SUMMARY
It seems Bug 476860 has reared its ugly head again.
When running Plasma 6 Wayland session on my Intel Arc B580 system, I get half
the FPS (30 instead of 60, 60 instead of 120).
STEPS TO REPRODUCE
0. Optional: Change GPU from AMD to Intel Arc, with a config previously at 120
Hz.
1. Login in to a Plasma 6 Wayland session
2. Notice half the framerate immediately
OBSERVED RESULT
The screen's (DP) signal is driven at the desired Hz, but only every other
frame is actually drawn.
Unlike Bug 476860, the "Show FPS" desktop effect does NOT accurately represent
the frame rate being half of desired, instead stating an FPS as if the output
worked correctly.
EXPECTED RESULT
Chosen target refresh rate.
SOFTWARE/OS VERSIONS
Operating System: Void Linux
KDE Plasma Version: 6.2.5
KDE Frameworks Version: 6.11.0
Qt Version: 6.8.2
Kernel Version: 6.13.4 (64-bit)
Graphics Platform: Wayland
Processors: Ryzen 7 5800X
Memory: 32 GiB of RAM
Graphics Processor: Intel Arc B580, with Xe driver
ADDITIONAL INFORMATION
In my setup the B580 runs using the Xe driver, not i915, which is (probably)
why the previous fix checking for i915 fails to work here:
https://invent.kde.org/plasma/kwin/-/commit/869e86ff0014e020c4076a8f22e78f69cab1063a#91b544134e3706774df2d5108043b8f8cef97fc9_78_78
.
Most likely Xe exhibits the same behaviour and needs the same bypass.
Just as with the previous bug, this is fixed temporarily by setting
`KWIN_DRM_NO_AMS=1`.
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