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No HDMI on Asrock RX 570 8 GB ( Only 2 DP ports working )

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This is my first post on this forum :)


I have succesfully installed Big Sur on my kinda old I7 2600 Sandy Bridge PC 

My videocard RX 570 is working, but when I connect the HDMI Big Sur is booting until the Videocard is activated and then I get a black screen.

Strange thing is that HDMI is working when I boot with the Opencore 0.6.3 USB stick. I copied the exact settings of the EFI on the USB  to the SSD EFI but then HDMI  stopped working.

Does anyone have a solution for this problem. How do I activate all the ports of this card? I have tried the AMD Framebuffer but that does not work.


Take a look at my config.plist


Thank u !


Grz Jerry


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