Aurora R8, onboard DisplayPort not working

Hello,

I have an Aurora R8 with the i9-9900K CPU. This processor is equipped with an UHD 630 internal GPU. When I connect my display to the onboard DisplayPort on the back panel the display will stay blank.

Only when I connect the display to the DisplayPort of the discrete GPU (NVIDIA RTX 2080 TI) then I will see an output.

Can somebody help?

The reason I want to connect the monitor to the internal GPU is that I use the discrete GPU for compute heavy tasks like deep learning. Under the heavy loud the desktop (mouse cursor, windows, etc.) will lag.

Best regards,

mi_schl_