On Sat, 14 Apr 2007 20:04:27 -0700, Steven Woody wrote:

> On Apr 14, 4:43 pm, loki harfagr <l...@DarkDesign.free.fr> wrote:
>> On Sat, 14 Apr 2007 09:22:20 +0200, Olive wrote:
>> > Steven Woody wrote:
>> >> hi folks,
>>
>> >> how do i get know what's my current USB device version? is it a
>> >> USB-1.x or USB-2.0? and how much speed difference between this two
>> >> specification?
>>
>> >> thanks.
>>
>> >> -
>> >> woody
>>
>> > You can look at /proc/bus/usb but the information that appear here
>> > are not very clear to me
>>
>> What's not "very clear" ? The parms labeled Spd: and Ver:
>> for resp. 'speed' and 'version' are quite plain aren't they ?-)
>>
>> > (there is also lsusb but I do not see this information).
>>
>> Use 'lsusb -v' and open the sleepy eye, you'll see the light ;D)
>
>
> sorry, i runed the lsusb, but still have not found what's the field
> indicating the version number?


That's the bcdUSB field that, for now, can take theses 3 values :
0x0100 (USB 1.0)
0x0110 (USB 1.1)
0x0200 (USB 2.0)

The xHCI value is related to speed capabilities of the controller :

There are three specs regarding host controllers,
each one will support only a subset of USB 2.0 device speeds,
the USB Enhanced Host Controller (EHCI) id for Hi-Speed
USB Universal Host Controller (UHCI)
and/or USB Open Host Controller (OHCI) are for "Full speed" and "low speed"

These speed are determined by ceilings :
Low speed, up to 1.5 Mbps
Full speed, up to 12 Mbps
Hi-Speed, up to 480 Mbps


So, you need ehci and ohci (or uhci) modules to be loaded
if you want/need different speeds, for instance I here have :
# lsmod | grep '[oue]hci'
ohci_hcd 19204 0
ehci_hcd 29580 0


Now, back to this nap attack ;-)