For future reference..
I had this same problem myself recently and it turned out to be an option in the bios for allowing virtualization direct access to low level hardware like USB devices.
I can't remember the name of the option but I'll see if I can find it again and post it here in case anybody else has this happening to them
EDIT: It's called IOMMU http://askubuntu.com/questions/85776/wha...erformance.
I had this same problem myself recently and it turned out to be an option in the bios for allowing virtualization direct access to low level hardware like USB devices.
I can't remember the name of the option but I'll see if I can find it again and post it here in case anybody else has this happening to them
EDIT: It's called IOMMU http://askubuntu.com/questions/85776/wha...erformance.