* firstboot-1.0.5-11 When firstboot launches an X server, it specifies vt7 explicitly (line 152). If for some reason an X server is already running on vt7 this can do very strange things to the box, possibly locking it up. See bug#86576 for more details. If you don't specify a VT number then X will take the first available and thus play nice with any existing X servers.
Should be fixed in firstboot-1.0.9-1 in Rawhide.