[libvirt-users] vga passthroufh fail

Hello, I encounter a problem, my display is not light when guest running. But it's successful that i check guest with command "ping". Following message is my xml and refer topic from https://libvirt.org/formatdomain.html#elementsHostDev: <hostdev mode='subsystem' type='pci' managed='yes'> <driver name='vfio' /> <source> <address domain='0x0000' bus='0x06' slot='0x02' function='0x0'/> </source> </hostdev>