Having the *exact* same issue. Sometimes I'll remember to power down the monitor first (push, down, confirm power off), and then power it on before waking computer. This has ~75% success rate in avoiding the wake issue. I'll add that sometimes in the black back-lit screen that pops up, it will sometimes show the Display Port (I use port 2) in the top left, many times it wont. The power toggle switch otherwise doesn't pop up an interface, though the hot buttons will show the current settings. Very frustrating for a brand-new monitor. FWIW, also using an AMD GPU, 5500XT.
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