/:  Bus 001.Port 001: Dev 001, Class=root_hub, Driver=ohci-pci/10p, 12M
    |__ Port 002: Dev 002, If 0, Class=Human Interface Device, Driver=usbhid, 12M
    |__ Port 002: Dev 002, If 1, Class=Human Interface Device, Driver=usbhid, 12M
    |__ Port 004: Dev 003, If 0, Class=Audio, Driver=snd-usb-audio, 12M
    |__ Port 004: Dev 003, If 1, Class=Audio, Driver=snd-usb-audio, 12M
    |__ Port 004: Dev 003, If 2, Class=Audio, Driver=snd-usb-audio, 12M
    |__ Port 004: Dev 003, If 3, Class=Human Interface Device, Driver=usbhid, 12M
/:  Bus 002.Port 001: Dev 001, Class=root_hub, Driver=ehci-pci/10p, 480M