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Proxmox gpu passthrough seen on the wrong machine

se flag

I have a very unique issue that might have a simple answer but I can't really find it anywhere. I currently have two nodes on my rack running proxmox. One is an old gaming PC that doesn't have IOMMU grouping capabilities but has a single 8-pin connector for PCIe devices like my graphics card. The other is a mid-2000s rackable systems server that has no 8-pin connector for powering my graphics card. I ended up rigging my current AMD graphics card to be connected to my rackable systems node via a PCIe 1x in a 16x slot- which would then be powered by my old gaming pc via the 8 pin power connector. I'm using a riser I bought off of Amazon. Its still being detected on the gaming PC but not the rackable systems server which makes no sense to me.

And as a little optional side problem I think I ended up frying my rackable systems VGA output when I tried passing my Windows VM through it. I don't really care that much about it but it would be nice if someone had an answer as to how I could fix it. It WAS detected as an IOMMU group in proxmox until I used it. Now there's no output at all.

Here's some useful outputs- nd-node is my gaming pc and node2 is my rackable systems

root@nd-node:~# lspci | grep -e VGA 
01:05.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] RS780L [Radeon 3000] 
root@nd-node:~# dmesg | grep -e "IOMMU"`

[    0.153151] AGP: Please enable the IOMMU option in the BIOS setup
[    1.305592] PCI-DMA: using GART IOMMU.
[    1.305594] PCI-DMA: Reserving 64MB of IOMMU area in the AGP aperture
root@node2:~# dmesg | grep -e IOMMU
[    0.169332] DMAR: IOMMU enabled

I'm obviously not an expert on this.

djdomi avatar
za flag
Re verify if the option is enabled in the bios as told

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