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davidhi7 / ddcci-plasmoid

KDE Plasma widget to adjust the brightness of multiple external monitors
MIT License
390 stars 11 forks source link

Brightness reverts to on-screen monitor GUI config during shutdown. #36

Closed RokeJulianLockhart closed 10 months ago

RokeJulianLockhart commented 1 year ago

Per https://github.com/JonMagon/plasma-screendimmer/issues/2#issuecomment-1636040125, reported here.

davidhi7 commented 1 year ago

So just to reiterate, the brightness set by the widget is reset after every reboot. Can you send the output of python -m ddcci_plasmoid_backend --debug detect? (skip the python -m part if you're using pipx).

Do you use any application that also does DDC/CI communication, for example vdu_controls? I think the most likely cause is that some other application overwrites the brightness every time you boot/shutdown.

To verify it is unrelated to other applications, try to boot into a Linux installer image, install ddcutil, run ddcutil detect, then run ddcutil setvcp --display <ID of the monitor> 10 <brightness value>. Reboot directly into a Linux installer image again and pay attention if the brightness is overwritten in the process.

davidhi7 commented 11 months ago

Similar to #37, this might be related to powerdevil, try to disable all display brightness related options in the KDE system settings under Power management > Energy saving.