https://bugs.freedesktop.org/show_bug.cgi?id=109239
--- Comment #6 from Samuel Pitoiset samuel.pitoiset@gmail.com --- FWIW, I have the same issue on both Polaris/Vega. Disabling DC on Polaris appears to fix the problem on my side. Also, those periodic random black screens seem to only happen with my 4K screen, I don't have this problem at 1080p.
Let me know if you need more info.