https://bugs.kde.org/show_bug.cgi?id=481161
Bug ID: 481161
Summary: HDR screen flickers when firefox or thunderbird is
open
Classification: Plasma
Product: kwin
Version: 5.93.0
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: przem.form...@proton.me
Target Milestone: ---
SUMMARY
I've got a multi-monitor setup with one of my screens being an HDR screen
(https://www.gigabyte.com/us/Monitor/M27Q-rev-20).
When switching to HDR mode on that HDR screen, the brightness starts flickering
whenever firefox or thunderbird are open and focused on that screen (they don't
need to be active, simple mouse hover is enough); haven't noticed this behavior
with any other application, non-Qt apps included.
STEPS TO REPRODUCE
1. Set screen to HDR
2. Open up firefox or thunderbird
3. Move your mouse cursor over that screen
OBSERVED RESULT
Screen is constantly fglickering between the below-lowest brightness and the
set brightness.
EXPECTED RESULT
Screen doesn't flicker at all.
SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 5.93.0
KDE Frameworks Version: 5.249.0
Qt Version: 6.7.0
Kernel Version: 6.7.4-arch1-1 (64-bit)
Graphics Platform: Wayland
Processors: 12 × AMD Ryzen 5 3600 6-Core Processor
Memory: 15.5 GiB of RAM
Graphics Processor: AMD Radeon RX 6700 XT
Manufacturer: ASUS
ADDITIONAL INFORMATION
The screen flickers even when the brightness is set to the lowest possible SDR
brightness in systemsettings.
When switching to HDR mode,, journalctl spams with constant message (about 10
times per second):
kwin_wayland[1237]: kwin_scene_opengl: 0x3: GL_INVALID_OPERATION in
glUniformMatrix(matrix size mismatch)
Didn't notice it with any other GTK apps
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