With the MacPro7,1 SMBIOS use -noweg or remove WhatEverGreen, agdpmod is not needed. The iGPU does not display an image. The Memory Config in the plist is needed.
With the iMac19,1 SMBIOS use agdpmod=pikera. The iGPU displays an image. I am using it for my second monitor.
I have a picture now, with the Radeon™ 64 LC and the RX 6900 XT activated. (I don't want to remove the Radeon™ 64 LC and then it still does not work).
But I have picture dropouts on the 6900.
What could be the problem?
Ah, the picture dropouts are caused by interferences that mess up the...
Ah, yes, macOS 11.4 public beta.
The RX 6900 XT is recognized, but I don't even have a black screen. The Monitor has no signal at all. In System Information, as you can see above, no monitor shown for the 6900.