(GPU passthrough) RX 580 not working but RX 470

Hell Angel

New Member
May 1, 2019
hi everyone,
I have RX 580 and RX 470 to passthrough on proxmox. Everything is fine with RX 580 until install driver, it's freeze the VM (not host, i have to qm stop XXX to shutdown it) but very weird that RX 470 was working ok although with installed driver. I tested both card on windows 10 host still installed driver normally on RX 580 without bug, I also tested with game, no bug with RX 580.
Note: I tested with single PCI-E (on the same PCI-E), not dual card on Proxmox but RX 580 still not working on VM, freeze the VM. RX 580 and RX 470 have same ID on lspci -n -s XXXX but different on (rev...). RX 580 worked fine on esxi.
Someone help me :(
Last edited:
hi update:
I got: Status: internal error
kvm: -device vfio-pci,host=26:00.0,id=hostpci0.0,bus=ich9-pcie-port-1,addr=0x0.0,multifunction=on: Failed to mmap 0000:26:00.0 BAR 0. Performance may be slow
Look into "AMD reset bug". I'm pretty sure it affects cards RX5* and up (inc. Vega).
no, it's not the reset bug
now both work but:
Hi everyone,


I passthroughed my GPUs successfully with Proxmox (above picture) but there are some problems, wish you guys can help me fix it:

1: When my host is reset or shutdown, I have to unplug the HDMI cables. If not, I cant start the VMs (the VM with HDMI unplugged), with error:

Failed to mmap 0000:27:00.0 bar 0. performance may be slow....

and when GPU driver loaded with windows the VM will be freezed, but host not. If I unplug the HDMI cables when the host is shutdown, then leave it headless, everything is ok, I can check through RDP, then plug the HDMI cables to VMs are fine too, no freezed. But you know it is very inconvenience, I want a way to fix it. This problem does not occur with Esxi but Proxmox. I switched to Proxmox because it's very easy to passthrough mouse and keyboard, in Esxi I have to passthrough all of USB controller and have to buy a USB PCI-E card for second VM, it is inconvenience too.

I also used:

echo "blacklist radeon" >> /etc/modprobe.d/blacklist.conf
echo "blacklist nouveau" >> /etc/modprobe.d/blacklist.conf
echo "blacklist nvidia" >> /etc/modprobe.d/blacklist.conf

and check in:

lspci -v

I saw GPUs was using: Driver of Vfio. So I think this is not a problem. I feel the host still eat the GPU although it cant load the driver

2: I want to use my CPU host name not the Common "Ugly" KVM

when I tried:

cpu: host,hidden=1,flags=+pcid
args: -cpu 'host,+kvm_pv_unhalt,+kvm_pv_eoi,hv_vendor_id=NV43FIX,kvm=off'

Yesterday, it worked fine, it showed the real CPU name

But today, it gave me:" host doesnt support reqested feature: CPUID.01H.ECX.pcid (bit 17) then it BOSD itself during windows load. How so ?

And can I affinity the CPU core/thread to VMs ?

3: I want to add new NVME SSD to VMs to use on VMs but is there any way to VMs use on the same Drive ?, like network Drive. I saw on net cafe they boot windows through the LAN and run games on it, the computers dont need a Hard disk.

4: can I limit bandwidth on VM's vlan ?

5: Very inconvenience, the Proxmox OS changed my time in BIOS automatically, it made the time slower than 7 hours, when I changed in BIOS then load Proxmox, it changed again. It made the VM wrong time too, I really hate it.

6: Is there a way to use Parsec without a HDMI dummy or monitor ? some people told me that use a resistor on DVI port but mine is DVI-D :').

My testing system:

CPU: Ryzen 5 1600X 6 core/12 thread

Main: X370 Gaming K4 latest BIOS AGESA


GPUs: RX 470 + RX 580

PSU: CM V1000

a bunch of SSDs and HDDs

Thanks in advance! :)


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