https://bugs.kde.org/show_bug.cgi?id=498277
Bug ID: 498277
Summary: Power Management KCM "Change screen brightness" UI
doesn't do anything.
Classification: Plasma
Product: plasmashell
Version: master
Platform: Neon
OS: Linux
Status: REPORTED
Severity: minor
Priority: NOR
Component: Power management & brightness
Assignee: plasma-b...@kde.org
Reporter: o...@geek.co.il
Target Milestone: 1.0
SUMMARY
On Plasma 6.2, setting the "Change screen brightness" slider to any value, on
any power state - does not appear to have any effect on the system at any
point.
STEPS TO REPRODUCE
1. Make sure the laptop is connected to AC power.
2. Open Power Management KCM
3. Under "On AC Power" check the "Change screen brightness" checkbox and set
the slider to some value (lets say - 75%").
4. Under "On Battery" check the "Change screen brightness" checkbox and set the
slider to some other value (lets say - 50%).
5. Unplug the AC power cable.
6. Re-plug the AC power cable.
OBSERVED RESULT
The laptop screen brightness does not change.
EXPECTED RESULT
The laptop screen brightness should change to 50% when power is disconnected,
and then change to 75% when the power is reconnected (I think, regardless of
what the brightness was set to before).
SOFTWARE/OS VERSIONS
Operating System: KDE neon Testing Edition
KDE Plasma Version: 6.2.5
KDE Frameworks Version: 6.10.0
Qt Version: 6.8.1
Kernel Version: 6.8.0-51-generic (64-bit)
Graphics Platform: Wayland
Processors: 20 × 12th Gen Intel® Core™ i7-12700H
Memory: 31.0 GiB of RAM
Graphics Processor: Mesa Intel® Graphics
ADDITIONAL INFORMATION
It appears that all of the other "Display and Brightness" toggles in the Power
Management KCM do not function either: setting "Dim automatically" doesn't dim
the screen after the specified time, no "Turn off screen". I haven't played
with "Change keyboard brightness" yet, so can't verify if that works.
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