https://bugs.kde.org/show_bug.cgi?id=460034
Bug ID: 460034
Summary: Frame skip during window resizing
Classification: Plasma
Product: kwin
Version: 5.25.5
Platform: Archlinux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: compositing
Assignee: kwin-bugs-n...@kde.org
Reporter: puspitaadak9...@gmail.com
Target Milestone: ---
SUMMARY
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Kwin constantly skips frames during & after window resizing. Since maximizing
windows also results in resizing, frame skip occurs in that case too. I have
tested this using glxgears.
There is no frame drop as reported by glxgears, but visibly, the animation gets
paused for around 500ms after resizing a window. This skip is also visible on
videos playing in VLC. Hence, it seems that kwin is skipping some frames after
resizing windows.
Resizing CSD windows doesn't cause this problem.
STEPS TO REPRODUCE
1. Open any application (non-csd)
2. Open glxgears.
3. Resize the window/maximize it.
3. Observe glxgears pause for a few moment.
OBSERVED RESULT
Kwin skips some frames for the whole desktop after resizing any window.
EXPECTED RESULT
Kwin should display every frame without skipping any.
SOFTWARE/OS VERSIONS
Linux: 5.15.70-1-lts
(available in About System)
KDE Plasma Version: 5.25.5
KDE Frameworks Version: 5.98.0
Qt Version: 5.15.6
ADDITIONAL INFORMATION
GPU: Mesa Intel® HD Graphics 2500
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