https://bugs.kde.org/show_bug.cgi?id=489050
Bug ID: 489050
Summary: KWin performance drops while Adaptive Sync is set to
"Automatic"
Classification: Plasma
Product: kwin
Version: 6.1.0
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: davutdemi...@hotmail.com
Target Milestone: ---
Created attachment 170865
--> https://bugs.kde.org/attachment.cgi?id=170865&action=edit
Video demonstrating the performance drop
SUMMARY
A while ago, i submitted this issue about panels stuttering on wayland while
adaptive sync is "automatic": https://bugs.kde.org/show_bug.cgi?id=487480.
Now the issue is mostly fixed. But i get big performance drops in KWin while
the adaptive sync is auto after the issue is fixed. Performance drops doesnt
occur when adaptive sync is disabled completely. Performance drops happens when
running an external app that uses some part of gpu, like electron apps and
games.
I attached a video demonstrating how a discord start up effects the performance
of KWin while using adaptive sync in automatic mode. I realized this issue as
soon as 6.1 released since i am used to use kwin on 144fps and it drops down to
about 60 or less.
STEPS TO REPRODUCE
1. Set adaptive sync to "automatic"
2. Start another program that uses gpu, like a game or an hardware accelerated
app
3. Observe the KWin performance
OBSERVED RESULT
Fps drops down to about 60 or less
EXPECTED RESULT
Fps should stay same at 140 or at least +120. From my previous experiences it
was always over 130.
SOFTWARE/OS VERSIONS
Linux: 6.9.6-arch1-1
KDE Plasma Version: 6.1.0
KDE Frameworks Version: 6.3.0
Qt Version: 6.7.1
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