Having trouble isolating iGPU for VM passthrough

Hi all,

I built a new NAS recently using the ASUS WS PRO W680-ACE SE motherboard and an Intel i5-12600K CPU. This specific motherboard has an onboard BMC (ASPEED 2600) with VGA output. I am trying to assign TrueNAS to use the BMC video controller so that I can isolate the Intel iGPU for passthrough to a VM. There are no GPUs available for isolation in the System > Advanced settings menu.

Things I have checked:

  • The iGPU is in its own IOMMU group by itself.
  • The onboard BMC VGA controller is detected by TrueNAS.

Has anybody else been able to figure out how to do this, or do I need to take a look at Proxmox and virtualizing TrueNAS?