Now adjusting brightness on multiple screens simultaneously no longer works for me on X11, with or without !411 applied. Did the intended behavior for this MR change as well? My understanding was that that the split was just to have a cleaner separation between prerequisite kwinbrightness tweaks and the actual multi-brightness change, but the effective behavior seems to have regressed compared to last time I tested this MR. Can you clarify what the intended effect is as of now?
A positive change is that the OSD now always appears on the active screen, but it still shows the brightness value of a different screen, so that UX issue is not resolved.