id = 1597
title = "Intel Arc A-Series GPUs VFIO passthrough no video out"
state = "closed"
created_at = "2023-04-13T04:22:19.631Z"
closed_at = "2023-05-09T01:43:48.009Z"
labels = ["VFIO"]
url = "https://gitlab.com/qemu-project/qemu/-/issues/1597"
host-os = "Arch Linux"
host-arch = "x86_64"
qemu-version = "7.2.1"
guest-os = "Windows 10"
guest-arch = "x86_64"
description = """Once the VM is booted, the screen goes blank."""
reproduce = """1. Passthough any Intel Arc A (Alchemist) series video card.
2. Boot VM.
3. Screen goes blank."""
additional = """I have startup and shutdown scripts that detach and reattach the card and these scripts work fine if I test them alone. It's only when I start the VM that issue presents itself.



kernel command line:

```
amd_iommu=on iommu=pt rd.driver.pre=vfio-pci pci=realloc iommu=1 i915.force_probe=*

```

startup script:

```
#!/bin/bash
# Helpful to read output when debugging
set -x

# Load the config file with our environmental variables
source "/etc/libvirt/hooks/kvm.conf"
source "/etc/libvirt/hooks/vmPreBootSetup"

cpuPerf

# Stop your display manager. If you're on kde it'll be sddm.service. Gnome users should use 'killall gdm-x-session' instead
systemctl stop gdm.service

# Unbind VTconsoles
echo 0 > /sys/class/vtconsole/vtcon0/bind
echo 0 > /sys/class/vtconsole/vtcon1/bind

# Avoid a race condition by waiting a couple of seconds. This can be calibrated to be shorter or longer if required for your system
sleep 2

modprobe -r drm_buddy intel_gtt video drm_display_helper cec ttm i915

# Unbind the GPU from display driver
virsh nodedev-detach $VIRSH_GPU_VIDEO
virsh nodedev-detach $VIRSH_GPU_AUDIO

# Load VFIO kernel module
modprobe vfio
modprobe vfio_pci
modprobe vfio_iommu_type1

sleep 5s ; systemctl restart connman.service

```"""