https://bugs.kde.org/show_bug.cgi?id=494577
Bug ID: 494577
Summary: Monitor Brightness Resets to Previous Dimmed Value
After Screen Wakeup on Fedora KDE
Classification: Plasma
Product: plasmashell
Version: master
Platform: Fedora RPMs
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Brightness and Color
Assignee: plasma-b...@kde.org
Reporter: hossains...@proton.me
CC: natalie_clar...@yahoo.de
Target Milestone: 1.0
SUMMARY
On Fedora 40 with KDE Plasma 6.2.0, the brightness of one of my two monitors
(LG 24GN600-B) gets stuck at the previous dimmed value after the screen turns
off due to power management. Adjusting the brightness slider no longer has the
expected effect, and the monitor doesn't brighten beyond the dimmed value,
requiring a restart to resolve the issue. The other monitor does not have this
problem.
STEPS TO REPRODUCE
1. Set the brightness of the affected monitor to any value, e.g., 75%, through
the brightness control menu.
2. Let the screen dim and then turn off automatically due to power management
settings.
3. Wake the screen back up.
OBSERVED RESULT
The monitor should restore the brightness to the previously set value (e.g.,
75%).
EXPECTED RESULT
The monitor brightness is stuck at the dimmed value, even though the brightness
slider can be set to 100%. Adjusting the brightness slider doesn't increase the
actual screen brightness above the dimmed value. Setting it to a lower value
(e.g., 10%) does dim the monitor further, but no value higher than the dimmed
value makes the screen brighter. A system restart is required to restore normal
brightness behavior.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Fedora Linux 40 KDE Plasma
KDE Plasma Version: 6.2.0
KDE Frameworks Version: 6.7.0
Qt Version: 6.7.2
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