https://bugs.kde.org/show_bug.cgi?id=494923
Bug ID: 494923
Summary: Since 6.2.0, using DisplayPort 2.1 (SDR) results in a
significantly darker image.
Classification: Plasma
Product: kwin
Version: 6.2.0
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: xna...@hydra-development.net
Target Milestone: ---
SUMMARY
Since 6.2.0, using DisplayPort 2.1 (DR) results in a significantly darker
image. It is possible to work around this bug (on my particular monitor) by
using HDR and cranking up the brightness, but this results in a different
picture compared to before.
When I switch back my monitor to DisplayPort 1.4, the issue disappears, but
this is not desirable since it doesn't support 240Hz under DisplayPort 1.4.
Also worth noting is that this only appears once KWin starts up. On a fresh
boot, the SDDM login screen is displayed at the correct brightness level, but
once the Plasma session starts, everything becomes significantly darker under
SDR.
STEPS TO REPRODUCE
1. Enter a Plasma Wayland session using DisplayPort 2.1 and SDR
OBSERVED RESULT
The picture is very dark / washed out
EXPECTED RESULT
The picture looks the same compared to DisplayPort 1.4
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: NixOS
KDE Plasma Version: 6.2.0
KDE Frameworks Version: 6.7.0
Qt Version: 6.8.0
ADDITIONAL INFORMATION
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