https://bugs.kde.org/show_bug.cgi?id=500210
Bug ID: 500210
Summary: Screen brightness no longer works in SDR on Wayland
Classification: Plasma
Product: plasmashell
Version: 6.3.0
Platform: openSUSE
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Power management & brightness
Assignee: plasma-b...@kde.org
Reporter: lastminutejane...@protonmail.com
Target Milestone: 1.0
SUMMARY
Changing screen brightness via qdbus or applet no longer works in SDR, only HDR
mode.
STEPS TO REPRODUCE
1. Decrease screen brightness by 50% via qdbus: qdbus6
org.kde.Solid.PowerManagement
/org/kde/Solid/PowerManagement/Actions/BrightnessControl
org.kde.Solid.PowerManagement.Actions.BrightnessControl.setBrightness
$(($(qdbus6 org.kde.Solid.PowerManagement
/org/kde/Solid/PowerManagement/Actions/BrightnessControl
org.kde.Solid.PowerManagement.Actions.BrightnessControl.brightness) - 5000))
2. Decrease screen brightness via Brightness and Color applet
OBSERVED RESULT
Screen brightness doesn't change unless I switch to HDR
EXPECTED RESULT
Screen brightness change regardless of color space
SOFTWARE/OS VERSIONS
Linux: openSUSE Tumbleweed
KDE Plasma Version: 6.3.0
KDE Frameworks Version: 6.10.0
Qt Version: 6.8.2
Kernel Version: 6.12.13
GPU Driver: NVIDIA 565.77
ADDITIONAL INFORMATION
This works perfectly with plasma 6.2.5. When changing brightness via the applet
in 6.2.5 the logs generate this message: plasmashell[3337]: ignoring brightness
change, it's coming from the applet itself. However, there aren't any messages
in 6.3 even after setting export QT_LOGGING_RULES="kwin_*.debug=true"
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