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.)
I see.
I haven’t tried mirrored displays (just never needed it). Perhaps I can try that out if I get a different size/res monitor.
My 100Hz display can do 60Hz, so I am expecting it to just drop to that when I mirror them with this setup.