Edward, > the whole system freezes for about 5 seconds or more? > I meet a very similar issue before on HP Envy 15 laptop when I plugged > usb device on xhci port. > My problem was BIOS still controlled xhci host controller. > Maybe you can try this patch. > http://markmail.org/message/vqcbzks4gnbrlir3 thanks, indeed, this seems to have solved the freezing issue! Akos -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html