MP 1,1-5,1 Problem with Mac Pro 2010 5,1 upgrade to Monterey RX580 no video display

[franzd]

I just recently created a Monterey OS boot thru OpenCore, and it went smooth. The only problem is my RX580 is not showing any video signal. I am now stuck to using the stock Radeon HD5770, just to see the screen. The system information is reading that I have an RX580, but no Kext Loaded. Anything I'm missing? Do I need to install some driver updates? please help. Really wanna upgrade to Monterey now.

BTW, I still have my perfectly running High Sierra SSD boot drive and my RX580 works just fine.

 

[Macschrauber]

you should not use two different GPUs in the same machine.

If it was just for debugging: Turn on Screen Sharing and go remotely. It's slow without a working GPU but better than nothing.