[SOLVED] SteamVR outputting only green color when used inside VM with GPU Passthrough

[d1xt1r]

Hello,
At work we have a rig running Proxmox. We have four "Windows 2016 Server" virtual machines. For each VM we have dedicated GPU (2x GTX 1080, 2x GTX 1080Ti with GPU passthrough). We are also passing through HTC Vive headset to the VMs and everything was working fine the last time I used the HTC Vive with the VMs which was few months ago. Currently there is an issue which causes SteamVR to output only green color in the HMD. Tracking is working, but you can only see green color in the HMD. I've tested on Proxmox 5.4, Proxmox 6.0, with Windows 10 VM, Windows Server 2016 VM, Windows Server 2019 VM. On each VM I'm seeing only green color in the HMD. When connected to a regular machine everything is working normally.
Here is a short video showing the green color in the SteamVR display mirror tool.

Has anyone encountered this problem? Thank you in advance!

 

[jimnordb]

Did you try different ports? please also post config for each vm along with a lspci -k. are the VM drivers custom? we need more details.

 

[d1xt1r]

Did you try different ports? please also post config for each vm along with a lspci -k. are the VM drivers custom? we need more details.

Thank you! I found out what is causing the issue.

 

[jimnordb]

Try this also https://forum.proxmox.com/threads/proxmox-6-0-5-win10-vm-100-cpu-usage-when-idle.57086/#post-263188

 

[d1xt1r]

Try this also https://forum.proxmox.com/threads/proxmox-6-0-5-win10-vm-100-cpu-usage-when-idle.57086/#post-263188

Thank you very much! I will try it and report back!

 

[d1xt1r]

Try this also https://forum.proxmox.com/threads/proxmox-6-0-5-win10-vm-100-cpu-usage-when-idle.57086/#post-263188

I've tried it (on Windows 10 1903, because this setting was not present on Windows Server 2016 and Windows Server 2019) but it didn't help with the issue.

But THIS solved the issue completely.