so the idea is that via shortcut or slider or command line, brightness can be changed
and thereby always BOTH the plugged-in AND plugged-out settings are changed of
the current powerplan (or of all powerplans, which would be even better).
Idea is that brightness adjustments become totally independent of plugged-in/out
(and of powerplans in general), thereby ridding users of constant re-adjustments
when frequently plugging in / out / frequently changing brightness due to
circumstances (night/day etc.)
There's no such programs, but I have found several ppl complaining about this.
Thanks for considering!