https://bugs.kde.org/show_bug.cgi?id=488539
Bug ID: 488539
Summary: After booting the system or waking from sleep, the
brightness of DDC-capable monitors does not match the
value set using the system tray applet
Classification: Plasma
Product: Powerdevil
Version: 6.0.5
Platform: openSUSE
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: plasma-b...@kde.org
Reporter: pavel.uru...@gmail.com
CC: m...@ratijas.tk, natalie_clar...@yahoo.de
Target Milestone: ---
SUMMARY
Every time I boot my PC or wake it from sleep, Plasma sets the brightness of my
external monitor (LG 24UD58 connected to an AMD GPU) to 50% despite the fact
that I set it to 100% using the control in the system tray. The brightness does
not go back to 100% unless I manually lower it and then raise it again. This
does not happen in other desktop environments, e.g. GNOME.
STEPS TO REPRODUCE
1. Boot KDE Plasma 6 on a system with a DDC-capable monitor connected.
2. Observe the issue.
OBSERVED RESULT
The brightness of the external monitor is set to 50% (confirmed using the
monitor's menu) despite the fact that the system tray applet shows that the
brightness is set to 100% (which is the correct user-specified value).
EXPECTED RESULT
The brightness is set to the user-specified value after the system boots or
wakes from sleep.
Additionally, it would be very nice if there was a toggle in the settings to
prevent Plasma from messing with external monitors.
SOFTWARE/OS VERSIONS
Operating System: openSUSE Tumbleweed 20240613
KDE Plasma Version: 6.0.5
KDE Frameworks Version: 6.3.0
Qt Version: 6.7.1
Kernel Version: 6.9.3-1-default (64-bit)
Graphics Platform: Wayland
Graphics Processor: AMD Radeon RX 560 Series
ADDITIONAL INFORMATION
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