https://bugs.kde.org/show_bug.cgi?id=476860
Bug ID: 476860
Summary: Plasma 6: Half the FPS with atomic mode setting
Classification: Plasma
Product: kwin
Version: git master
Platform: Neon
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: peter.eszl...@gmail.com
Target Milestone: ---
Created attachment 163063
--> https://bugs.kde.org/attachment.cgi?id=163063&action=edit
kwin info
SUMMARY
When running Plasma 6 Wayland session on my old Intel Haswell system, I get
half the FPS (30 instead of 60).
STEPS TO REPRODUCE
1. login in to a Plasma 6 Wayland session
2. enable "Show FPS" desktop effect
OBSERVED RESULT
The "Show FPS" desktop effect show a value of ~30fps, with jumps up to 50fps,
when interacting with the desktop.
EXPECTED RESULT
Constant 60fps.
SOFTWARE/OS VERSIONS
Operating System: KDE neon Unstable Edition
KDE Plasma Version: 5.27.80
KDE Frameworks Version: 5.245.0
Qt Version: 6.6.0
Kernel Version: 6.2.0-36-generic (64-bit)
Graphics Platform: Wayland
Processors: 4 × Intel® Core™ i5-4690 CPU @ 3.50GHz
Memory: 22.4 GiB of RAM
Graphics Processor: Mesa Intel® HD Graphics 4600
ADDITIONAL INFORMATION
This works in Plasma6/X11, Plasma5/Wayland and Plasma5/X11 on the same
computer.
Under Plasma6/Wayland I get a constant 60fps when disabling atomic mode setting
using KWIN_DRM_NO_AMS=1.
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