Here is my latest Clover config, if you are going to use it, change it, etc...pay an attention to the boot args, namely to the param agpmod=vit9696. Without this param the config does not work.
The only thing I couldn't get is making my mDP port the primary display and HDMI port the secondary one.
Tried to change connector, but couldn't get the dual monitors working. Dunno if this is possible. As I've told earlier,
I run dual boot, the second OS is Ubuntu 20.04. And on Ubuntu this setup works great.
BTW, I've changed my SMBIOS to the macmini8,1.
Another note, my HDMI port works only as 4K30Hz, if I change to the 4K60Hz there is no output from the port, monitor goes blank. I've got DP on both monitors, I could connect my Dell to the HDMI port and make it as the primary monitor, but in this case it will run at 4k30Hz, which I don't want for this beautiful beast.
The config has no SMBIOS and SystemParameters data, please add yours.