Catalina - Intel HD4600 not detected

Hello.

I've got a problem with my catalina installation and the iGPU Intel HD4600.

Here is my setup:

Gigabyte GA-Z87X-UD5H
Intel Core i7 4770K 1150 Haswell using its internal Intel HD Graphics 4600 only
16 GB RAM
System Disk: Samsung 840 Pro Serie 256GB SSD

The system is booting up fine but the Intel HD4600 iGPU (iGPU only system) is not detected correctly. At the moment the system only shows me "Display 8MB" for the graphics card and the screen is mirrored on both connected displays...

Read more