I recently found out about the lsusb command while troubleshooting a headset issue..
My laptop runs debian and doesn't have anything plugged into USB currently, but when I run the "lsusb" command, I still get quite a bit of output:
root@t500:~# lsusb
Bus 008 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 003: ID 0a5c:2145 Broadcom Corp. Bluetooth with Enhanced Data Rate II
Bus 004 Device 002: ID 08ff:2810 AuthenTec, Inc. AES2810
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 002: ID 0781:b6d0 SanDisk Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Could someone break down what this means in more detail?
The SanDisk card is connected via PCMCIA, not USB. Are both PC cards and USB devices listed in lsusb?
I don't have any external bluetooth connected, why would this display?
Why are some root hubs 1.1, and some 2.0? Does that mean some of my USB ports are 2.0 and others aren't?
What is a root hub exactly, just an empty USB port?