IOMMU enabled but not detected

This post is giving me some hope since I am running on the very same hardware Minisforum TH50 (cpu: i5-11320h).
The CPU supports VT-d but I don't know if the motherboard supports it (the link does not work and I cannot find TH50 on their website) or if it is enabled in the BIOS.
Code:
# cat /proc/cmdline

BOOT_IMAGE=/boot/vmlinuz-6.8.12-2-pve root=/dev/mapper/pve-root ro quiet intel_iommu=on
intel_iommu=on is no longer required; it is on by default since kernel version 6.8.
So, if i am following well, IOMMU groups are missing... but I have no clue how to get it.... HELP...
You need to enable IOMMU or VT-d in the motherboard BIOS (if it is supported by the motherboard).
Update to the latest BIOS? Enable the setting in the BIOS? Contact Minisforum about this?
 
So the support answered that the machine is too old to update the firmware.

But no answer if it's compatible or not ...

Si I finally decided my self to dismount my only monitor from my office and go to the garage to check directly the bios and fount the VT-d settings and enable it..

Now I have the groups... and I will be able to pass my iGPU to my homeassistant VM in order to try tu use it within Frigate or more realistically setup a new LXC for Frigate and pass the iGPU to it

Thank you all for this post
 
Last edited:
Hey guys I'm back! With a solution!

backstory: I'm in the middle of trying to debug a packet loss issue between proxmox and an Opnsense VM. It occurs to me that it would be real nice if I could rule out virtual bridge shenanigans by passing though the NIC directly.

I get the usual "No IOMMU Detected" message in the proxmox UI, so I google "Minisforum TH50 iommu" and find a link to a forum post here. This forum post. My unresolved post.

Anyway I took another crack at it, and halfway through dumping the bios I see another thread about a different minisforum PC, where the advanced BIOS options are hidden behind a key combo.

To enable Vt-d IO passthrough on the Minisforum TH50:
Go to BIOS. Hit Alt+F5, then Okay. Save and exit, and enter BIOS again.

Now there is a (frankly overwhelming) "Advanced" and "Chipset" tab.
Under the "Chipset" tab, enter the first option group (forgot the name)
"Enable Vt-d" is in that page, near the top.

Reboot to proxmox, and blam! pass through all the PCIe devices you want
 
Can someone help me too .
Even after doing all the steps mentioned above I am not able to get rid of the iommu error.
My laptop specs are:
Asus Vivobook x515jab
with i3-1005g1 cpu
 

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