dpkg -l | grep firmware
ii bluez-firmware 1.2-3 all Firmware for Bluetooth devices
ii firmware-atheros 20161130-3 all Binary firmware for Atheros wireless cards
ii firmware-linux-free 3.4 all Binary firmware for various drivers in the Linux kernel
ii firmware-realtek 20161130-3 all Binary firmware for Realtek wired/wifi/BT adapters
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 6: Dev 3, If 0, Class=Mass Storage, Driver=ums-realtek, 480M
/: Bus 03.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/2p, 5000M
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/2p, 480M
|__ Port 2: Dev 2, If 0, Class=Human Interface Device, Driver=usbhid, 12M
|__ Port 2: Dev 2, If 1, Class=Human Interface Device, Driver=usbhid, 12M
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/2p, 480M
|__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/6p, 480M
|__ Port 4: Dev 3, If 1, Class=Wireless, Driver=, 12M
|__ Port 4: Dev 3, If 0, Class=Wireless, Driver=, 12M
|__ Port 5: Dev 4, If 0, Class=Video, Driver=uvcvideo, 480M
|__ Port 5: Dev 4, If 1, Class=Video, Driver=uvcvideo, 480M