I am trying to get my r9 390 to run correctly on Big Sur. I was able to get my system to boot however the 390 is not working (glitchy and non transparent dock). I followed the Dortania guide to create the GPU Spoof SSDT for the 390 -> 390x however when I add that to my EFI it no longer boots. It gets stuck on a line from PowerService complaining about AMD8000 controller. Not sure where to go from here.
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