DisplayPort handshake fails on suspend and resume
Got a new monitor recently. Microstep 24" G274QPX. It's very slow to wake, is I think the issue, but right off the bat, it has about a 50% chance to fail to resume after suspend. I suspected the monitor of being bad at that but kept it anyway, because RMA is painful shipping costs here.
A few kernel later, I was pleasantly surprised to find it resuming more than 70% of the time. Neat! 6.7.5 I believe? I'll see if I can figure out later. 6.7.7 and newer, up to 6.8.1, however, have a 100% failure to wake the display after suspend and resume, unless the display is turned on before the machine resumes.