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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!

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up vote 19 down vote accepted

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! :)

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So there is no way to do this without device attach? – CAMOBAP Aug 8 '16 at 9:36
    
@CAMOBAP How would you determine it without it being attached? It needs to be attached for the system to see it. – Duncan X Simpson Nov 22 '17 at 2:58
    
but why, AFAIK (maybe I'm wrong), both port and device have specified USB protocol version, and if you put USB 1.x device in USB 3.0 port it still will work by 1.x protocol. So why we cannot determine USB version of port by itself? – CAMOBAP Nov 22 '17 at 9:21

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