Screen brightness not saved between sessions

[skyfishgoo]

you can try this tweak

or use gddccontrol

Disable KDE monitor brightness control?

There has been a lot of brightness work in Plasma 6.2, with some new features to manage multi-screen brightness control, and unfortunately it looks like introduced some unintended behaviors. There are quite a few discussions about this in this forum, here’s a link to one that lists some relevant bug reports that you may want to track. Regarding how to disable powerdevil DDC control: Open a terminal (for example, by running Konsole) Run the command systemctl --user edit plasma-powerdevil.servi…