Voici quelques commandes, explications et exemples pour identifier précisément un device USB sous GNU/Linux.

lsusb permet de lister ce qui est connecté sur les ports USB d'une machine.

$ lsusb 
Bus 002 Device 004: ID 04b3:310c IBM Corp. Wheel Mouse
Bus 002 Device 005: ID 1038:1202 Ideazon, Inc. 
Bus 002 Device 003: ID 05e3:0608 Genesys Logic, Inc. USB-2.0 4-Port HUB
Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 004: ID 0525:a4a2 Netchip Technology, Inc. Linux-USB Ethernet/RNDIS Gadget
Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

On peut préciser différentes choses, afficher les résultat pour un seul device

# lsusb -s 001:002
Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub

Avec l'option -v (verbose), on obtient beaucoup de détails !

# lsusb -v -s 001:005
(... plein de détails! ...)

On peut voir pas mal de choses via dmesg.

Combinaison de watch, dmesg et tail :

$ watch 'dmesg | tail -n 25'
[11715.340424] usb 1-1.4: USB disconnect, device number 5
[11715.342479] cdc_ether 1-1.4:1.0 usb0: unregister 'cdc_ether' usb-0000:00:1a.0-1.4, CDC Ethernet Device
[11721.624573] usb 1-1.4: new high-speed USB device number 6 using ehci-pci
[11721.719324] usb 1-1.4: New USB device found, idVendor=0525, idProduct=a4a2
[11721.719329] usb 1-1.4: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[11721.719331] usb 1-1.4: Product: RNDIS/Ethernet Gadget
[11721.719333] usb 1-1.4: Manufacturer: Linux 3.10.40+ with tegra-udc
[11721.721259] cdc_ether 1-1.4:1.0 usb0: register 'cdc_ether' at usb-0000:00:1a.0-1.4, CDC Ethernet Device, 36:f1:cd:19:ca:56
[11878.242195] usb 1-1.4: USB disconnect, device number 6
[11878.244389] cdc_ether 1-1.4:1.0 usb0: unregister 'cdc_ether' usb-0000:00:1a.0-1.4, CDC Ethernet Device
[11878.466612] usb 1-1.4: new high-speed USB device number 7 using ehci-pci
[11878.559636] usb 1-1.4: New USB device found, idVendor=0955, idProduct=7740
[11878.559641] usb 1-1.4: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[11878.559643] usb 1-1.4: Product: APX
[11878.559645] usb 1-1.4: Manufacturer: NVIDIA Corp.
[11887.449193] usb 1-1.4: USB disconnect, device number 7
[11887.741747] usb 1-1.4: new high-speed USB device number 8 using ehci-pci
[11887.834440] usb 1-1.4: New USB device found, idVendor=0955, idProduct=7740
[11887.834445] usb 1-1.4: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[11887.834448] usb 1-1.4: Product: APX
[11887.834450] usb 1-1.4: Manufacturer: NVIDIA Corp.
[12127.086904] usb 1-1.4: USB disconnect, device number 8
[12151.361153] usb 1-1.4: new high-speed USB device number 9 using eh
ci-pci
[12151.454129] usb 1-1.4: New USB device found, idVendor=0955, idProd
uct=7740
[12151.454135] usb 1-1.4: New USB device strings: Mfr=1, Product=2, S
erialNumber=0
[12151.454137] usb 1-1.4: Product: APX
[12151.454139] usb 1-1.4: Manufacturer: NVIDIA Corp.
[12263.926649] loop: module loaded
[12266.237587] EXT4-fs (loop0): mounted filesystem with ordered data
mode. Opts: (null)
[12851.726213] usb 1-1.4: USB disconnect, device number 9
[12872.800267] usb 1-1.4: new high-speed USB device number 10 using e
hci-pci
[12872.895059] usb 1-1.4: New USB device found, idVendor=0525, idProd
uct=a4a2
[12872.895064] usb 1-1.4: New USB device strings: Mfr=1, Product=2, S
erialNumber=0
[12872.895076] usb 1-1.4: Product: RNDIS/Ethernet Gadget
[12872.895078] usb 1-1.4: Manufacturer: Linux 3.10.40+ with tegra-udc
[12872.896911] cdc_ether 1-1.4:1.0 usb0: register 'cdc_ether' at usb-
0000:00:1a.0-1.4, CDC Ethernet Device, 26:e1:b1:af:cf:29