Comment 37 for bug 1580459

FYI I had a similar issue years ago until I figured out that adding the vgarom file fixes it, eg.:

     -device vfio-pci,host=04:00.0,bus=root.1,multifunction=on,x-vga=on,addr=0.0,romfile=Sapphire.R7260X.1024.131106.rom

For radeon, you can look in /sys. eg. we see /sys/devices/pci0000:00/0000:00:0b.0/0000:04:00.0/rom, and first we `echo 1 > rom` to prevent "invalid argument" error, and then `cat rom > ~/yourfile.rom` and you have it.

For nouveau, you have to bind nouveau driver (rather than vfio-pci) and you can find it somewhere like /sys/kernel/debug/dri/0/vbios.rom