Victicious

For anyone coming across this in the future, twiikker's "Preferred Alternative for recent libvirt + qemu" XML edit in the link above worked for me. My setup is a Dell R720XD with multiple GPUS running Unraid 6.9.2 stable in Legacy Mode. For some reason, GPUs populated in certain PCIe slots would always throw error code 43 once the NVIDIA driver was loaded. They also would not work with Linux VMs once the NVIDIA Linux drivers were loaded. I figured it was the driver detecting the virtual environment because before loading NVIDIA drivers, the GPUs would indeed output video using either default Linux display drivers, or the Microsoft Basic Display Driver. However, once the NVIDIA driver loads, bam, no more video output on Linux and code 43 in Windows! Using twiikker's suggestion, all I had to do for those GPUs with error, was add the following to my XMLs for those VMs: <domain> ... <features> ... <kvm> <hidden state='on'/> </kvm> ... <hyperv> ... <vendor_id state='on' value='whatever1234'/> </hyperv> ... </features> ... </domain> That's literally all I did and it's been fixed ever since. This has worked for both an EVGA GT 1030 and Zotac GT 710 (PCIe x1) cards. Both had VBIOS's dumped by myself on the same system using Spaceinvader's CLI technique. This seems to be an issue that can still occur, perhaps especially on these lower end cards, and depending on specific hardware configurations. Hopefully this helps someone in the future and saves some blood, sweat, and tears!