I use manual from wiki: http://pve.proxmox.com/wiki/USB_physical_port_mapping
# lsusb -t
/: Bus 04.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/2p, 480M
|__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/8p, 480M
|__ Port 3: Dev 3, If 0, Class=Human Interface Device, Driver=usbhid...