To be honest, having checked the 2 logs out side by side and mines pretty similar - shows even less info that the one already there though. I few of the numbers are different, but with my limited knowledge I think it's just part identifiers and what screenmode it's trying.
I'll have a go at disabling xhci when I get home - I thought I'd already tried it but i'll just cycle through all the options for usb from the bios menu - there's not many and the one that disables all usb I can probably ignore.
One thing that's confusing me - it fails the same even when booting from a cd, surely the usb settings shouldn't matter at that point? I haven't tried grabbing serial output when booting from cd though, i'll try that and see if that gives the same output