I too am running into this same issue. I already have iGPU disabled, and I recently updated to Catalina. I can get mine to work on iMac 14,2 but if I try it with iMac Pro 1,1 or anything else, only one screen will work. It was working previously with Mojave just fine on both screens with iMac...
Anyone experiencing issues with Radeon VII and Catalina? I can get mine to boot with latest stable Clover r5070, and latest drivers, but it will only work on the last DisplayPort on the card, and will only show on one monitor. It will not load or detect any other monitors. Was working fine...
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