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.)
This is just a shot in the dark, but:
I recently learned enough about the differences between HDMI and DisplayPort to boil them down in my mind to “HDMI Bad. DisplayPort Good.”
Wild oversimplification, I know.
So now, whenever I have display issues of any kind, the first thing I do is upgrade the cable to a DisplayPort cable.
I mention this specifically because I have felt like my monitor wake and sleep behavior became more predictable.
Sorry, this idea really is mostly vibes. (Informed by my perception that HDMI has a crazy amount of control signaling which itself is proprietary and inconsistently implemented.)
But for the cost of an $8 cable, I feel like swapping in a DisplayPort has led to better display outcomes for me.