Just giggled as my last meme mentioned trouble with displays and appropriately, a large chunk of the replies were “well MY displays work just fine!” (And charmingly, many were thoughts of things to check, other distros etc. It’s a very kind community, though that may also be the fediverse.)
Yep, know about that. Set it up back when I tried a few Debian-based distros. I’m using Plasma with Dolphin now, which has its own thumbnailer that relies on icoutils. I’ve got the whole thing set up and enabled, it just… doesn’t work.