https://bugs.kde.org/show_bug.cgi?id=504680
Bug ID: 504680
Summary: Video "flickering" on fullscreen with adaptive sync on
(fps exceed maximum)
Classification: Plasma
Product: kwin
Version First 6.2.5
Reported In:
Platform: Fedora RPMs
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
I don't have a screen recording because the bug does not get included in the
video. Basically the edges of the screen keep "blinking" black slightly in a
high frequency (maybe twice a second?) which gets very distracting. I can
reproduce it easily on Stremio (flatpak) and once I got it while playing Red
Dead Redemption 2 on Steam. I don't get this problem on Youtube
(Brave/Firefox).
The bug only happens when I'm on fullscreen, so I tried disabling adaptive sync
and it worked. My theory is that the framerate does not match the monitor
correctly. I can't provide a screenshot because it does not include the fps on
it but I enabled "Show FPS" on Kwin and the fps increased to 285~288 instead of
my monitor maximum fps of 144 (roughly double the max fps). But this may just
be a wrong report by KWin.
I created a post on Reddit and a user confirmed on the comments:
https://www.reddit.com/r/kde/comments/1jxrh1a/video_flickering_on_fullscreen_with_adaptive_sync/
One comment said: "Everything going fullscreen makes one of my monitors
flicker. Not both, just one. I haven't been able to game or watch videos in
fullscreen on that monitor for about a month because of the issue."
Operating System: Fedora Linux 41
KDE Plasma Version: 6.3.4
KDE Frameworks Version: 6.12.0
Qt Version: 6.8.2
Kernel Version: 6.13.10-200.fc41.x86_64 (64-bit)
Graphics Platform: Wayland
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