Problems with IOMMU and GPU pass through


New Member
Sep 25, 2023
Hello! This is my first time posting on this forum, so sorry if I am a little long winded.

  • The issue I am running into is that I am unable to get my GPU pass through to work on my new proxmox server. I have a sneaking suspicion that the motherboard that I have might not support ACS, I am not completely sure of this. Below is the output of the
    pvesh get /nodes/{nodename}/hardware/pci --pci-class-blacklist ""
    from Proxmox's own PCI Passthrough article
  • 1695677535856.png
  • I am mostly concerned about the GTX 1060, and why is it in a "-1" IOMMU group?
  • Another thing to note is that when I run a script to show me all the devices that are in IOMMU groups it only goes up to 19 and 8 IOMMU groups, while the 1060 is on 41 with no Group
    • IOMMU Group script, only shows 8 groups and 19 "devices" not including the gpu
  • 1695677814819.png
  • Output from "lspci -k"
  • 1695678127231.png
  • You can also see that the GPU is still using NVIDIA and Nouveau drivers, even though I tried disabling them with
  • Code:
    echo "blacklist nouveau" >> /etc/modprobe.d/blacklist.conf
    echo "blacklist nvidia" >> /etc/modprobe.d/blacklist.conf
    modprobe -r nvidia
    modprobe -r nouveau

  • Here is my grub config
    • 1695677875281.png
  • Results from "dmesg | grep -e DMAR -e IOMMU"
    • 1695678584184.png
  • I've tried different PCIe Slots. 8x vs 16x, I havent messed with bifurcation but I dont think that would help me. Any help at all with this would be greatly appreciated.
    • Here are the specs for the system, I assume the motherboard isnt playing nice but what do I know
    • 1695678451809.png


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