https://bugs.kde.org/show_bug.cgi?id=499366
Bug ID: 499366
Summary: Set QSG_NO_VSINK=1 or
QSG_USE_SIMPLE_ANIMATION_DRIVER=1 to avoid jerking in
some effects
Classification: Plasma
Product: kwin
Version: unspecified
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: effects-various
Assignee: kwin-bugs-n...@kde.org
Reporter: guido.iod...@gmail.com
Target Milestone: ---
Ever since switching to QSG for many effects I have noticed that they would
occasionally have microshakes, more like a loss of a few frames. Experimenting
I found that setting QSG_NO_VSINK=1 solved the problem. Not only that, it seems
that this was also related to another problem: when I brought the mouse to the
corner of the screen, where I had set the Overview effect, it would start and
come back quickly.
Now it no longer does this. I don't think it is advisable to set QSG_NO_VSINK=1
for the whole environment, my suggestion is to do this only for Kwin within the
code. Another approach could be QSG_USE_SIMPLE_ANIMATION_DRIVER=1 which seems
to achieve the same result and seems to be preferred in this guide:
https://doc.qt.io/qt-6/qtquick-visualcanvas-scenegraph.html
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