Blank display when GPU passthru on chinese x99 (HNZ QD4)

[promoxer]

I'm setting up a VM to have gpu passthrough, IOMMU is enabled, but when I start my VM from CLI, I get this.

kvm: -device vfio-pci,host=0000:03:00.0,id=hostpci0.0,bus=ich9-pcie-port-1,addr=0x0.0,multifunction=on: Failed to mmap 0000:03:00.0 BAR 3. Performance may be slow

And fixed by adding `initcall_blacklist=sysfb_init` to /etc/default/grub

But when I start the VM, display is blank. Any ideas?

 

[leesteken]

But when I start the VM, display is blank. Any ideas?

Did you set the VM's Display setting to None? To force the use of the passed through GPU?

 

[promoxer]

Eventually it worked, I think it was because the VM (Windows) was still loading the drivers for the Nvidia GPU.