Proxmox 8 - Intel iGPU HDMI passtrough issue on Windows 11 (error 43)


New Member
Jul 27, 2023
Hello everyone,

I am having issues making the iGPU be used as a passtrough for my machine.

I have a small computer powered by a N95 processor.

I have followed this guide, so my grub configuration contains:

GRUB_CMDLINE_LINUX_DEFAULT="quiet intel_iommu=on iommu=pt pcie_acs_override=downstream,multifunction initcall_blacklist=sysfb_init video=simplefb:off video=vesafb:off video=efifb:off video=vesa:off disable_vga=1 vfio_iommu_type1.allow_unsafe_interrupts=1 kvm.ignore_msrs=1 modprobe.blacklist=radeon,nouveau,nvidia,nvidiafb,nvidia-gpu,snd_hda_intel,snd_hda_codec_hdmi,i915"

My /etc/modules contains the following:

# Modules required for PCI passthrough

I have attached my iGPU like so:


I have installed the intel drivers, but I get an error 43 under the device management.

It is worth noting that with this configuration I can get the HDMI output of my device to work for an Ubuntu VM.

Can someone point me in the right direction to get the iGPU working on windows 11 ?

I thank you in advance for your help !

hello @azsde
I've got the exact same problem.
And for information, when I pug an HDMI screen on the HDMI connector of my NUC (a Greekom Mini IT13, with an Intel i9-13900H and an Iris Xe graphics as iGPU), I've got a black screen.
It should show the windows screen...
@azsde Hi!
I managed to get the driver working inside the windows VM. No more error 43.
But I don't know if it really works, aka if the iGPU was used...
But no screen output when HDMI screen is connected to the NUC.

In order to achieve this, I had to follow this, by creating virtual iGPU :
And to modify a file in the drive according to this :
Read the whole issue ;)

But that was with Proxmox 8.0.

I don't try this with 8.1 because I formatted all the NUC ton install Win11 and do some test with VMWare inside...

I'll try this when I'll install again Promox, maybe the 8.1 ^^
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