I've attached my Unraid VM config below for reference, it reads as a Qemu config just formatted as XML.ĮDIT: I have also tried vendor id 1234567890ab with the same results (instead of just abc123). At this point, without AMD drivers, the system is usable, but refresh rate seems to be ~30hz (based on visual appearance) or less, and I'm hoping official drivers can fix that. I was hoping to get some input here as to what I could try next? I feel like I'm so close, and would love to make a guide on what I did to get this running, as several users on different forums seem to be wanting to do the same, whether it'd be on Proxmox or Unraid. I have also tried with AMD drivers 20.9.1 (Sept 2020) and 20.45.36 (Feb/Mar 2021), in addition to the AMD Pro 20.Q4 (which wouldn't even install since APUs aren't supported) which was suggested in one of the posts I linked above. I also tried the following, so Windows doesn't think it's in a VM anymore, with no success: I have followed the suggestions as best I could, setting my vendor_id to something random, turning on the kvm hidden_state, and even ioapic driver='kvm' - all to no avail. I have seen reports that AMD may now be checking to see if we run their GPUs in a VM and this could cause issues. If I run DDU to uninstall all AMD drivers, everything returns to normal as well. If I "disable device" for the iGPU in Device Manager (thanks to RDP, no way I could use a display connected via HDMI/DP), video output returns to normal. One issue I've been struggling with is that as soon as I install from AMD's site (or let Windows 10 install automatically) any AMD Radeon drivers for the iGPU, the video output becomes a complete mess (see pic attached below).
Thsi involved the ACS override patch in the kernel (pcie_acs_override=downstream,multifunction) as well as clearnign the EFI frame buffer (video=efifb:off), I also had to boot to my hypervisor in UEFI mode, but my guest had to be in SeaBIOS mode on a Q35 machine. After much trial and error, I finally got my AMD Ryzen 4750G APU to pass through its iGPU to a Windows 10 VM in both Unraid and Proxmox (both Qemu/KVM).
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