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Passthrough iGPU (no.lastname.nz)
submitted 1 year ago by to c/proxmox@lemmy.world
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OK, this is really annoying...

I have an intel based PC that I use as a server that is sitting under the lounge TV that I was using to drive the TV with a linux VM using pci pass-through of the iGPU.

Every thing was working well, then all of a sudden there was no output to the TV. The iGPU still works fine during boot.

I have just updated proxmox to the latest, and no better results.

I sometimes will get it to work on a new install of a vm, but on reboot of the vm it all stops.

Any thoughts on where/what to look at?

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[–] 2 points 1 year ago (4 children)

Could be that the igpu doesn't properly "hot reset" and that once the vm shuts down it gets stuck with the host.
This theory is easiest to test by checking if a shutdown, remove power, plug in power, startup of the proxmox host allows the existing vm to grab the igpu again.
If that works then a workaround could be to never shutdown the vm.

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  • [–] [S] 2 points 1 year ago (1 child)

    That was the only thing that I could find as well.

    It dossn't seem to work on first boot, but I'm not sure that I have taken out the power fully.

    It's really anoying that when it stoped it was only an update to the Neon VM that brought it all down. I cant remember any system updates at the same time.

    I don't really want to buy a buy a gpu

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  • [–] 2 points 1 year ago

    I infrequently have the same troubles with my dgpu (Although running Debian with KVM and qemu instead of Proxmox) and the remove power and letting the machine be out of juice has been the only solution for my dgpu to reset properly in those situations.
    I even press the power button a few times before plugging the machine in again, although I think that is completely unnecessary.

    There are some "hot reset" scripts you can find when it comes to pci passthrough, but they did nothing for me.

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    • [–] 1 point 1 year ago* (last edited 1 year ago)

    If you're passing the iGPU to the VM then the host can't use it if the VM is on.

    If your host supports SR IOV, then have a look at this repo: https://github.com/strongtz/i915-sriov-dkms

    Installing this on Proxmox and your guest means the guest(s) and host to use the iGPU at the same time.

    I'm not sure if it's in mainline somewhere but I had to install this DKMS to get it working.

    Just realised your driving the TV with a VM. This probably isn't relevant then.

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