How to Fix Issues with GPU Spoof SSDT in Opencore Big Sur
Graphics issues usually stem from an unsupported GPU, missing acceleration patches, or incorrect boot arguments.
Quick Fix Steps
- Verify GPU support: Check if your GPU is natively supported via WhateverGreen docs.
- Update kexts: Ensure Lilu and WhateverGreen are current.
- Check boot arguments: Add
-v keepsyms=1 debug=0x100for debugging, oragdpmod=pikerafor AMD. - Test Metal: About This Mac > System Report > Graphics.
Verification
- Graphics acceleration is smooth.
- Metal is reported in System Information.
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Original Question: "Issues with GPU Spoof SSDT in Opencore Big Sur"
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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