Hi All,

I recently tried to passthrough my Onboard NIC to my Ubuntu VM however despite the fact that I've successfully attached it, the VM boots without the NIC.

When I checked the logs, I'm getting the below error, anything I can try to resolve this?

Edited October 27, 2025Oct 27 by efamose

What is your IOMMU group layout?

I assume this is an intel-i219 nic. I THINK it is possible that it does not support 'function level reset'. Hence the 'no available reset mechanism' error. You could try 'ACS override' in the VM Manager.

Hi Aran, this is the OIMMU groupping:

The option of the ACS override in the VM Manager sounds interesting, what option would you suggest I use? "Downstream, Multi-option or Both" ?

Just had a look and I can see 00:1f.5 is the Serial bus controller, is that for just this IOMMU group or for all the USB controllers on the motherboard?

Could this affect the function of the any USB's plugged into the machine, including the Unraid drive?

Ok, first things first. Is this the only nic you have in your system? Because if it is, you cannot use this nic to pass through because unraid itself needs it. Do you really need to use seperate nic for your VM? You can just use a virtual network in your vm.

I suggest you watch this video from SpaceInvaderOne.

It's a bit dated but still relevant.