https://bugs.kde.org/show_bug.cgi?id=504349
Bug ID: 504349
Summary: Wayland HDR still using 80cd/m² for Windows scRGB
instead of 203cd/m² reference luminance.
Classification: Plasma
Product: kwin
Version First 6.3.90
Reported In:
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: minor
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: sanar-mo...@ya.ru
Target Milestone: ---
Created attachment 181394
--> https://bugs.kde.org/attachment.cgi?id=181394&action=edit
kscreen-doctor -o
SUMMARY
Wayland HDR still using 80cd/m² for Windows scRGB instead of 203cd/m² reference
luminance.
Running same games with same calibration through Gamescope has correct
reference target of 203 regardless of color space
STEPS TO REPRODUCE
1. Set 1000 nit peak and 203 target brightness with HDR calibration tool on
desktop
2. Launch any scRGB HDR game using wayland (Control, Cyberpunk 2077)
3. Adjust in game calibration accordingly
4. See that 203 desktop brightness is clipping on brightest light sources
5. Adjust desktop brightness to 80 nits
6. Verify that highlights in game are no longer clipping.
OBSERVED RESULT
In game highlights are clipping when desktop brightness is set to 203
In game highlights are no longer clipping when desktop brightness is set to 80
EXPECTED RESULT
Correctly calibrated in game highlights not clipping when desktop brightness is
set to 203
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Arch Linux 6.15.0-rc6-273-tkg-eevdf
KDE Plasma Version: 6.3.90
KDE Frameworks Version: 6.14.0
Qt Version: 6.9.0
ADDITIONAL INFORMATION
Proton version used to test Wayland
https://github.com/GloriousEggroll/proton-ge-custom/releases/tag/GE-Proton10-1
Gamescope version used to verify findings
gamescope-git-3.16.8.r1.g1f121c6e-1
Steam launch options with wayland
PROTON_ENABLE_WAYLAND=1 PROTON_ENABLE_HDR=1 mangohud %command%
Steam launch options with gamescope
DXVK_HDR=1 gamescope -f -W 2560 -H 1440 -S integer -F nearest --hdr-enabled
--hdr-sdr-content-nits 1000 --force-grab-cursor --rt --mangoapp -- %command%
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