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apparently my PCIe bifurcation pin mod breaks amdgpu (at least when the GPU is plugged into the bifurcated slot, even when it only uses 4 lanes)

I tried testing my RX6400 in my pin modded OptiPlex 9020 SFF (forgetting it was pin modded) and amdgpu crashed. (I assume it was the pin mod at least, it works in my 5050 SFF (with my coreboot port on it!) and my 7020 SFF is currently in use so I can't test it there and I don't want to undo the pin mod now)
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