https://bugs.kde.org/show_bug.cgi?id=386333
Bug ID: 386333
Summary: Heavy stuttering with KWin and triple buffering
Product: kwin
Version: 5.11.2
Platform: Other
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: compositing
Assignee: kwin-bugs-n...@kde.org
Reporter: tarding...@googlemail.com
Target Milestone: ---
Using triple buffering leads to stuttering of window contents while KWin
effects remain smooth. The stutter can be observed both on my desktop using the
NVIDIA blob and on my Ivy Bridge laptop using the free Intel driver. If I
recall correctly, I observed similar issues on an AMD card but I can not test
this anymore since I do not have the card anymore. Forcing double buffering
with KWIN_TRIPLE_BUFFER=0 seems to fix the problems. Another workaround is to
set MaxFPS and RefreshRate to 70. The problem affects both OpenGL with GLX and
OpenGL ES using EGL.
Steps to reproduce:
1. Start kwin_x11 with KWIN_TRIPLE_BUFFER=1
2. Start glxgears
3. Stutter should be visible
In comparison, KWin shouldn't stutter when used with KWIN_TRIPLE_BUFFER=0
This website can be pretty useful to test for stuttering too:
https://www.testufo.com/stutter#demo=smooth&foreground=ffffff&background=000000&pps=720
There are multiple other bug reports which might describe the same issue:
https://bugs.kde.org/show_bug.cgi?id=381444
https://bugs.kde.org/show_bug.cgi?id=353038
https://bugs.kde.org/show_bug.cgi?id=344433
https://bugs.kde.org/show_bug.cgi?id=351700
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