/:  Bus 001.Port 001: Dev 001, Class=root_hub, Driver=ehci-pci/6p, 480M
    |__ Port 001: Dev 002, If 0, Class=Human Interface Device, Driver=usbhid, 480M
    |__ Port 002: Dev 003, If 0, Class=Human Interface Device, Driver=usbhid, 480M
/:  Bus 002.Port 001: Dev 001, Class=root_hub, Driver=ohci-pci/3p, 12M
    |__ Port 001: Dev 002, If 0, Class=Chip/SmartCard, Driver=[none], 12M
/:  Bus 003.Port 001: Dev 001, Class=root_hub, Driver=xhci_hcd/4p, 480M
/:  Bus 004.Port 001: Dev 001, Class=root_hub, Driver=xhci_hcd/4p, 5000M