On Mon, Oct 15, 2012 at 10:20 AM, M A Young <m.a.young@xxxxxxxxxxxx> wrote: > > If you haven't already done so I suggest you get rid of anything in > /etc/modprobe.d/ you added, just in case that is getting in the way. > > Michael Young I double checked, nothing about xen-pciback in /etc/modprobe.d and /etc/modprobe.conf is empty These files appear to be stock: [root@xenhost ~]# ls /etc/modprobe.d blacklist.conf openfwwf.conf udlfb.conf I also tried booting the 3.5.6-1 fedora kernel, same difference. modprobe xen-pciback fails, this is logged to /var/log/messages Oct 15 13:05:59 xenhost kernel: [ 178.996253] xen_pciback: Unknown parameter `0)' -- xen mailing list xen@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/xen