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Have you tried switching between GPU outputs to see if the problem is port based?Honestly, more than seeing AppleTV on the ryzentosh I would like to solve the blackscreen problem that recurs from time to time.
Maybe with SSDT-BRG0 I solve that as well
I have tried everything; HDMI or DP, PCIe switching in uefi, when i think I have solved ... it comes backHave you tried switching between GPU outputs to see if the problem is port based?
Also if you have multiple monitors in use have you tried dropping down to a single screen to see if the problem remains?