https://bugs.kde.org/show_bug.cgi?id=500219
Bug ID: 500219
Summary: Wayland: compositor running at half the selected
refresh rate
Classification: Plasma
Product: kwin
Version: 6.3.0
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: compositing
Assignee: kwin-bugs-n...@kde.org
Reporter: nafend...@gmail.com
Target Milestone: ---
SUMMARY
In Wayland, but not X11, displays run at half the refresh rate that they're
meant to be, running the BlurBusters UFO test on my 60 Hz secondary monitor
shows that it's running at 30 fps and dragging the test to the 165 Hz primary
monitor causes it to run at 82 fps. Running any vsync application also
corroborates the issue, and even the cursor is obviously running at half the
refresh rate. However, a fullscreen application that triggers adaptive sync on
the primary monitor runs at the full refresh rate. Setting adaptive sync to
"Always" also allows the primary monitor to run at the full refresh rate, but
not the secondary monitor as it does not have adaptive sync support.
STEPS TO REPRODUCE
1. Have an Intel Battlemage GPU running the Xe driver
2. Set adaptive sync on your display to "Off" or "Adaptive"
3. Run anything that can display the vsync framerate or just observe the cursor
movement
OBSERVED RESULT
Displays run at exactly half the selected refresh rate
EXPECTED RESULT
Displays run at the selected refresh rate
ADDITIONAL INFORMATION
Despite also being an Intel (UHD 620) GPU, my laptop has no such issue - may be
driver dependent, but kwin-wayland is at fault as well because it doesn't
happen on X11
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