https://bugs.kde.org/show_bug.cgi?id=494134
Bug ID: 494134
Summary: SDR brightness setting affects HDR brightness (Plasma
6.2 beta)
Classification: Plasma
Product: kwin
Version: 6.1.90
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: colour-management
Assignee: kwin-bugs-n...@kde.org
Reporter: lojcs...@gmail.com
Target Milestone: ---
SUMMARY
SDR brightness setting affects HDR brightness (Plasma 6.2 beta)
STEPS TO REPRODUCE
1. Install kwin 6.1.90-1
2. Enable hdr.
3. Open hdr video in mpv launched with `ENABLE_HDR_WSI=1 mpv --vo=gpu-next
--target-colorspace-hint --gpu-api=vulkan --gpu-context=waylandvk
--player-operation-mode=pseudo-gui --target-gamut=bt.2020` command.
4. Use the sdr brightness slider or kscreen-doctor to change sdr brightness.
5. Brightness of video changes
OBSERVED RESULT
Brightness of the video changes in relation to the sdr brightness. Opening the
same video side by side in normal mpv, the hdr one remains brighter / darker
than the same video opened in normal mpv based on the brightness of the video,
but is moreso affected by the sdr brightness setting.
EXPECTED RESULT
Sdr brightness doesn't affect hdr brightness or the setting should be labeled
differently
SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 6.1.90
KDE Frameworks Version: 6.6.0
Qt Version: 6.8.0
Kernel Version: 6.10.10-arch1-1 (64-bit)
ADDITIONAL INFORMATION
I've seen https://bugs.kde.org/show_bug.cgi?id=478860 but this seems to be
happening again in plasma 6.2 beta, wasn't sure if I should necro that one so I
made a new report. Doesn't happen if I downgrade kwin to 6.1.5-2. Monitor
connected to amd igpu via dp. Effect compounds with system tray brightness
slider.
Possibly related to https://bugs.kde.org/show_bug.cgi?id=494128 (elevated black
levels). The SDR brightness slider doesn't affect the black level unless system
tray brightness slider is turned low so I filed these seperately.
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