https://bugs.kde.org/show_bug.cgi?id=483240
Bug ID: 483240
Summary: VRR below 30-ish FPS turns off completely
Classification: Plasma
Product: kwin
Version: 6.0.1
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: t...@nitrosubs.live
Target Milestone: ---
SUMMARY
Adaptive sync set to "Automatic" or "Always" does not work with content
refreshing below 30 FPS (or close). This makes 24 FPS video content less
pleasant to watch (than on Plasma 5), as LFC probably doesn't get a chance to
kick in.
This does not happen on Plasma 5.
STEPS TO REPRODUCE
Open up mpv with a 23.98 FPS video playing fullscreen or vkcube/vrrtest limited
to 30 FPS.
OBSERVED RESULT
Video juddering/monitor OSD saying the screen actually refreshes at 165Hz (my
refresh rate).
EXPECTED RESULT
LFC kicks in properly no matter what the refresh rate is.
SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 6.0.1
KDE Frameworks Version: 6.0.0
Qt Version: 6.6.2
Kernel Version: 6.7.8-arch1-1 (64-bit)
Graphics Platform: Wayland
ADDITIONAL INFORMATION
I assume this is due to one MR/issue I remember seeing on the Plasma GitLab one
day about keeping a certain minimum refresh rate for content, which was
introduced to eliminate screen flickering with some panels. My panel has never
manifested such issues, I've never ever seen flickering no matter how weird the
content refresh rate was and how often it was changing. Is there a way to
override this behavior with some kind of envvar?
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