https://bugs.kde.org/show_bug.cgi?id=487697
Bug ID: 487697
Summary: Enabling adaptive sync causes stuttering and some sort
of flickering.
Classification: Plasma
Product: kwin
Version: git-stable-Plasma/6.1
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: forum.z8...@dralias.com
Target Milestone: ---
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SUMMARY
When enabling adaptive sync a lot of things on the desktop start stuttering in
a way that looks like flicker because the brightness / colour changes. This is
happening on 6.0.5 stable and on 6.1 beta installed via the kde-unstable Arch
repo.
STEPS TO REPRODUCE
1. Enable adaptive sync (setting it to always makes it easier to get these
situations).
2. Just do nothing.
3. See the screen flicker.
OBSERVED RESULT
It feels a lot like the refresh rate of the display as a whole is being
reduced. While the display is running smoothly with 200 Hz, when I enter
fullscreen in VLC for example it feels a lot more like the cursour moves at
around 60 Hz. Also when on the desktop moving the cursour slowly makes the
flicker go away but as soon as I move the cursour too fast it comes back again
in certain applications. Other applications like Firefox are smooth no matter
the cursour speed as long as it is moving. Also typing insider Firefox gets rid
of the flicker, I'm fairly certain that is because of a spinner animation from
LanguageTool inside textboxes as that would cause the refresh rate to stay high
I guess.
EXPECTED RESULT
Everything should be smooth as the refresh rate should only be reduced if there
is nothing on the desktop requesting a higher refresh rate. So for example a
cursour and the animations of VLC should increase the refresh rate to 200 Hz
instead of staying at whatever the framerate of the video playing is.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Kernel 6.9.2-2-cachyos
Mesa: 24.0.1-1
KDE Plasma Version: 6.0.90
KDE Frameworks Version: 6.2.0
Qt Version: 6.7.2
ADDITIONAL INFORMATION
I am aware that this might be a duplicate. However, the other issues are either
with older versions, with the Nvidia driver, or markes as fixed upstream so
this might still add value.
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