How to Listing USB Devices

Because USB devices are connected to a separate controller, a different command, lsusb, must be used to list them. The lsusb utility is provided by the usbutils package. Install this package via Red Hat Network.

If executed without arguments, the lsusb command displays each USB bus and any devices attached to them on a separate line as shown.

USB Device List

Bus 002 Device 001: ID 0000:0000

Bus 003 Device 001: ID 0000:0000

Bus 004 Device 001: ID 0000:0000

Bus 005 Device 001: ID 0000:0000

Bus 001 Device 001: ID 0000:0000

Bus 001 Device 004: ID 046d:c501 Logitech, Inc. Cordless Mouse Receiver

Similar to PCI devices, each USB device has a unique ID. lsusb probes for this ID and references the /usr/share/hwdata/usb.ids file for the vendor, product name, and model number. If this information is found for the ID, this more user-friendly information is displayed in the lsusb output as shown in the last line for the cordless mouse. To view more information about each bus, use the command lsusb -v. For example,

Shows the verbose output for the cordless mouse

Verbose Output for a USB Device

Bus 001 Device 004: ID 046d:c501 Logitech, Inc. Cordless Mouse Receiver

Device Descriptor:

bLength 18

bDescriptorType 1

bcdUSB 1.10

bDeviceClass 0 (Defined at Interface level)

bDeviceSubClass 0

bDeviceProtocol 0

bMaxPacketSize0 8

idVendor 0x046d Logitech, Inc.

idProduct 0xc501 Cordless Mouse Receiver

bcdDevice 9.10

iManufacturer 1 Logitech

iProduct 2 USB Receiver

iSerial 0

bNumConfigurations 1

Configuration Descriptor:

bLength 9

bDescriptorType 2

wTotalLength 34

bNumInterfaces 1

bConfigurationValue 1

iConfiguration 0

bmAttributes 0xa0

Remote Wakeup

MaxPower 50mA

Etc………