https://bugs.kde.org/show_bug.cgi?id=376116
Bug ID: 376116
Summary: Output limited to 60 FPS?
Product: kwin
Version: 5.9.0
Platform: Other
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: general
Assignee: kwin-bugs-n...@kde.org
Reporter: gr...@sub.red
Target Milestone: ---
The graphical desktop output feels locked at 60 FPS, even when the screen
supports a higher refresh rate. Screen is set to 90, 120 or 144 Hz and only the
hardware cursor seems to benefit from that. Using the plasma desktop effect to
show the current fps does confirm the lock just above 60 (~62).
This results in noticeable stuttering and non smooth output. It might be
related to #353038, additional tests to confirm are scrolling, moving windows
or open a browser and visit http://testufo.com/#test=photo&photo=quebec.jpg
Also, setting V-Sync to "never" seems not to be accepted. This might explain
stuttering. I can't observe tearing as long as compositing is enabled. When
disabled (alt+shift+f12 or disable on start), tearing is clearly visible.
I'm using Arch, but also can confirm the problem exists on Neon. Using
xf86-video-ati, -amdgpu or the generic modesetting driver. Also tried
en-/disabling TearFree and PageFlip options.
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