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Intel Arc A-Series GPUs VFIO passthrough no video out
Description of problem:
Once the VM is booted, the screen goes blank.
Steps to reproduce:
1. Passthough any Intel Arc A (Alchemist) series video card.
2. Boot VM.
3. Screen goes blank.
Additional information:
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
```
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