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Recently (debian testing) some update changed the behaviour of the brightness in KDE.
Whenever I restart the brightness resets to 9% even though I have it set at 30%. This is with nightlight enabled (not sure if it makes a difference.) Furthermore randomly the brightness slider disappears. restarting powerdevil 

systemctl --user restart plasma-powerdevil.service

fixes it temporarily.

STEPS TO REPRODUCE
1. 
2. 
3. 

OBSERVED RESULT


EXPECTED RESULT


SOFTWARE/OS VERSIONS
Windows: 
macOS: 
(available in the Info Center app, or by running `kinfo` in a terminal window)
Linux/KDE Plasma: 
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION