Comment 44 for bug 1726548

Maybe mine is completely different, since its the whole screen resolution that changes. In my case its msm as driver (Adreno 690), where dp link issues are aready confirmed and it's worked on. Still, I have the hpd pin disabled, and it mitigates the behaviour. There are some other odd issues. If I extend the screen resolution to 4k@60, the longer suspend / resume will deliver a blue screen (how fitting), unrecoverable. If I set the resolution to 2k (2560x1440@60) it will resume without lots of fuss. Sometimes the Display Power off is not permanent, but screen doesn't come up completely (only backlight is on).
This is the same on XOrg and Wayland, but reducing resolution appears to mitigate the issue. For me it looks like some race condition that interrupts dpu / dp setup and operation, but its hard to debug.