How to determine USB Version 1.1 or 2.0

Question

I have got a Ubuntu server 9.10 system with a USB storage attached.

It works very, very slow. Is there a command to test whether it's 1.1 or 2.0 usb?

How can I find out?

Thanks for your help!

Answer 1

Plug your device in, then see syslog:

$ tail -n 2 /var/log/syslog
Dec 22 17:25:14 localhost kernel: [73348.931267] usb 2-3: new high speed USB device using ehci_hcd and address 13
Dec 22 17:25:14 localhost kernel: [73349.084555] usb 2-3: configuration #1 chosen from 3 choices

Note the device bus id there: usb 2-3. Now get the version:

$ cat /sys/bus/usb/devices/2-3/version
2.00

Cheers! :)