https://bugs.kde.org/show_bug.cgi?id=500685
Bug ID: 500685
Summary: Adaptive Sync randomly causes refresh rate to get
stuck at 48Hz
Classification: Plasma
Product: kwin
Version: 6.3.1
Platform: Fedora RPMs
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: madness...@proton.me
Target Milestone: ---
SUMMARY
KWin will randomly drop my refresh rate to 48Hz on the desktop, plasma
applications and chromium browser. Oddly enough when maximizing firefox, the
monitor jumps back to 144Hz. Hovering Konsole over a maximized firefox window
will cause the refresh rate to drop back to 48Hz.
I haven't been able to find a consistent way of reproducing this. Changing the
Adaptive Sync option from 'Automatic' to 'Never' in these situations does not
resolve the issue. The monitor will continue using 48Hz until I unplug and
re-plug the monitor.
With the default logging rules I can't see anything useful in `journalctl`.
I've plugged both monitors into the same GPU (7900 XTX), and I haven't tested
if a single monitor setup also suffers from this issue.
Oddly enough this problem also occurs on Gnome 47 with the experimental VRR
setting, indicating it's an AMDGPU problem.
STEPS TO REPRODUCE
1. Set Adaptive Sync to 'Automatic' [Default setting on VRR-capable displays].
2. ..Wait until the bug appears.
OBSERVED RESULT
The desktop, and many of the applications, will use the lowest refresh rate of
the monitor. Which is 48Hz in my case.
EXPECTED RESULT
The refresh rate should stay at 144Hz. Like it does, vast majority of the time.
SOFTWARE/OS VERSIONS
Linux: Fedora 41
KDE Plasma Version: 6.3.1
KDE Frameworks Version: 6.11.0
Qt Version: 6.8.2
ADDITIONAL INFORMATION
GPU: AMD 7900 XTX (Nitro+)
Mesa: 24.3.4
Kernel: 6.12.15 (also occurs on 6.13.2)
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