I remember trying all this on GNOME before finding the extension. But I’ll check again, thank you

Display & Monitor says Built in Screen. The brightness slider here doesn’t work either. What else can I check?

But Solus is rolling release.

Similar thoughts and after hopping a bit I’m liking Solus really well. It’s rolling release but what they call “curated” rolling release. They take a little bit of time to iron stuff out. There’s a weekly update cycle.

The installation is through live ISO and was pretty easy, took only a few minutes. They have a Plasma ISO too, since you mentioned wanting KDE.

As a plus, I’ve not once used the command prompt in the past couple of months since I installed (GNOME first and then since the last week, KDE). I’m not averse to commands but I do want something that I can recommend to my less techy anti-capitalist friends. My games have all been working fine too.

Edit to add: I think they’ve also mentioned that their aim is for a personal desktop.