https://bugs.kde.org/show_bug.cgi?id=501382
Bug ID: 501382
Summary: Monitor goes blank if a window is fullscreened after
disabling VRR via the Monitor OSD.
Classification: Plasma
Product: kwin
Version: 6.3.2
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: fuzzyqu...@scrapyard.link
Target Milestone: ---
SUMMARY
If I set Variable Refresh Rate to Automatic then disable VRR via my Monitor's
OSD, any fullscreen window blanks the monitor indefinitely until said
fullscreen window is closed or changed to Windowed mode. Changing Plasma's VRR
setting to "Never" prevents the bug happening.
STEPS TO REPRODUCE
1. Plug in a variable refresh rate monitor, make sure VRR is turned on via the
Monitor OSD.
2. in System Settings, set Variable Refresh to automatic or always.
3. Open any web browser, load a YouTube video and fullscreen the YouTube video.
4. (Optional) Open any other fullscreen application.
OBSERVED RESULT
Monitor goes blank but never actually loses signal.
EXPECTED RESULT
Application fullscreens correctly.
SOFTWARE/OS VERSIONS
Linux: 6.12.13-273-tkg-eevdf, Arch Linux
KDE Plasma Version: 6.3.2
KDE Frameworks Version: 6.11
Qt Version: 6.8.2
GPU: NVIDIA GeForce RTX 3060 Ti
Driver version: NVIDIA-Open 570.124.04
Monitor: Acer RG241Y 165hz connected via DisplayPort.
ADDITIONAL INFORMATION
If I change Variable Refresh to "Never" after disabling VRR via the Monitor
OSD, the bug no longer reproduces. I remember on a previous version of Plasma
the settings used to vanish entirely if I disabled VRR via the monitor OSD.
This points to either a regression or an NVIDIA Driver bug as I previously
attempted the repro steps in normal usage while I still had an AMD graphics
card.
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