https://bugs.kde.org/show_bug.cgi?id=494630
Bug ID: 494630
Summary: Monitor brightness dim before fully logged in
Classification: Plasma
Product: kwin
Version: 6.2.0
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: output configuration
Assignee: kwin-bugs-n...@kde.org
Reporter: tts...@outlook.com
CC: xaver.h...@gmail.com
Target Milestone: ---
SUMMARY
I use Wayland and KWin on my SDDM. When I updated to 6.2.0, the login screen
and the splash screen of Plasma becomes quite dark, and goes back to normal
after Plasma is fully loaded. I have tried `cat
/sys/class/backlight/nvidia_wmi_ec_backlight/brightness` on a tty, which shows
that backlight brightness is the same as normal (25% brightness). It seems that
apart from managing the backlight, KWin is reducing the brightness of the
pixels. My current workout is editing
`/var/lib/sddm/.config/kwinoutputconfig.json` and set `brightness` to `1`, but
the splash screen is still dimmed.
STEPS TO REPRODUCE
Happens on its own and I have no idea. Will provide further information if any
test required.
OBSERVED RESULT
Using KWin outside Plasma gets brightness dim.
EXPECTED RESULT
Screen dim is controlled by backlight brightness as before.
SOFTWARE/OS VERSIONS
KWin Version: 6.2.0
KDE Plasma Version: 6.2.0
KDE Frameworks Version: 6.6.0
Qt Version: 6.7.3
Kernel Version: 6.11.3-zen1-1-zen (x64)
ADDITIONAL INFORMATION
SDDM Wayland configuration:
```
[General]
DisplayServer=wayland
GreeterEnvironment=QT_WAYLAND_SHELL_INTEGRATION=layer-shell
[Wayland]
CompositorCommand=kwin_wayland --drm --no-lockscreen --no-global-shortcuts
--locale1
```
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