usb info

[Rick Stevens]

Mark Knecht wrote:
> On 7/13/05, Chuck Lawrence <CELawrence at lbl.gov> wrote:
> 
> 
>>1.  how can I determine, with some certainty, whether the bus is 1.1 or 2.0?
> 
> 
> cat /proc/bus/usb/devices and look at the "Ver=" entry. From my Gentoo
> laptop. Note: The driver is also a good clue, I think. ehci is 2.0.
> ohci is 1.1.

Yes, but the dead giveaway is shown in your listing, marked by me:

> 
> flash ~ $ cat /proc/bus/usb/devices
> 
> T:  Bus=05 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#=  1 Spd=480 MxCh= 5
                                                     ^^^^^^^
<snip>

"Spd=480" is 480Mbps and that's USB2.  If it said "Spd=12", NOW you've
got USB1.1 (12Mbps), and now you know why they say USB2 is 40 times
faster than USB1.1 (480/12 = 40).  Simple, no?
----------------------------------------------------------------------
- Rick Stevens, Senior Systems Engineer     rstevens at vitalstream.com -
- VitalStream, Inc.                       http://www.vitalstream.com -
-                                                                    -
-      A day for firm decisions!!!   Well, then again, maybe not!    -
----------------------------------------------------------------------