Everything built from git master. Works as expected in Plasma 6.2.1 STEPS TO REPRODUCE 1. Set it up to change the brightness to 50% when on battery, and 100% when plugged in; apply 2. Unplug it OBSERVED RESULT Nothing happens EXPECTED RESULT The screen switches to 50% brightness
Lucky us, it's fixed with today's git master!
Aaaand it's back again. Looks like this is Bug 494956. *** This bug has been marked as a duplicate of bug 494956 ***