Hi - so that folks can best guide you, could you please share the basic information about your system from the Info Center app?
To help folks best guide you, could you please provide your basic system information from the Info Center app? The Copy Details button is the easiest way to get that ready to paste in:
I don’t have personal experience with multiple monitors, but just to double-check, are you able to see if those issues persist without asusctl or supergfxctl?
Did the folks who indicated that it was a known bug, with a fix on the way, provide a Bugzilla ID (from https://bugs.kde.org) or a commit/merge request link (from https://invent.kde.org)?