Yeah, it seems that this was not the best choice...
Ok, I will give it a try to avoid errors.
In regard to the bios update, it doesnt change anything, but ok. The only GPU in the system is the iGPU and this is set to enabled in bios.
I struggle a bit with the overall power consumption of the system. When all drives spins down and docker is running (no vms, no additional pci-cards) I have 18W consumption, but ok.
Thanks a lot for your help.