Can you test with another sound card?
If you want to test my EFI
but you have to change some things, because I have another motherboard ...
For the HDMI, try Catalina 10.15.4. (Mojave is too old)
DP-HDMI cable I don't know if it works.
AAPL,pci, it is the same for both IGPU-Headless and IGPU with connectors.
I have not understood this question:
And the routing of the ports is also based on gfxutil results?
This is the configuration I'm using now.
Bios 1001 to activate IGPU MultiMonitor.
There are 3 Aux.
Just hit the space bar to see them.
I have disabled USB2 HS9-HS10, USB3 SS3-SS4...
As for the UHD630, unfortunately, the "IGPU Multi Monitor" parameter is missing from the BIOS Menu, and therefore in my opinion it does not activate when I use the AMD 560.
I tried with (HDMI), but as we know with Catalina 10.5.5, HDMI doesn't work.
In the next few days I try with a DP...
I have had many difficulties to map USB ports.
I have tried with USBInjectAll.kext + with XHCI Port limit Patch.
Result, no working USB port, and therefore I built a map by inserting all the ports (I hope) and especially the HS13 ...
and you were right there is the Aura Led...