https://bugs.kde.org/show_bug.cgi?id=482717
Bug ID: 482717
Summary: Force software Vsync causes Kwin Windows to stutter
when dragging
Classification: Plasma
Product: kwin
Version: 6.0.1
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: kwin-bugs-n...@kde.org
Reporter: rick...@refused.net
Target Milestone: ---
SUMMARY
Kwin windows are stuttering when dragging windows or when switching desktops.
STEPS TO REPRODUCE
It does not seem to like having these set:
KWIN_X11_REFRESH_RATE=144000
KWIN_X11_NO_SYNC_TO_VBLANK=1
KWIN_X11_FORCE_SOFTWARE_VSYNC=1
More specifically KWIN_X11_FORCE_SOFTWARE_VSYNC. If i set that to 0 all seems
good.
It worked fine in KDE 5.
OBSERVED RESULT
Jerky window movement and jerky Virtual desktop animation scrolling/switchimg.
EXPECTED RESULT
Smooth movement.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: CachyOS - Linux 6.7.8 - KDE 6.0.1
KDE Frameworks Version: 6.0.0
Qt Version: 6.6.2
ADDITIONAL INFORMATION
It does not always happen, the jerky virtual desktop scrolling seems to be
present if there are open windows on both desktops.
Main monitor is 144hz, secondary monitor is 60hz.
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