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

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 (there is also lsusb but I do not see this
information).

An alternative is to install lshw
(http://ezix.org/project/wiki/HardwareLiSter). This tool provide a very
comprehensive and clear view of your hardware (It will tell you amoung
other the protocol and speed supported by your various USB devices)

Olive

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)

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?

-
woody

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

> sorry, i runed the lsusb, but still have not found what's the field
> indicating the version number?

Look for a line like this:

iProduct 2 UHCI Host Controller

If you see "UHCI" that means USB 1.x
If you see "EHCI" that means USB 2.x

You may also see these terms (uhci/ehci) with the "lsmod" command, which
would indicate which module was loaded, which would tell you what version
of USB you have...

--
"Ubuntu" -- an African word, meaning "Slackware is too hard for me".

Dan C <youmustbejoking@lan.invalid> wrote:
>
> You may also see these terms (uhci/ehci) with the "lsmod" command, which
> would indicate which module was loaded, which would tell you what version
> of USB you have...

This would explain why the new USB flash reader I recently bought doesn't work
while my somewhat older one does. I guess the new one isn't backwards
compatible.

- Kurt

~kurt <actinouranium@earthlink.net>:

> This would explain why the new USB flash reader I recently bought doesn't
> work while my somewhat older one does. I guess the new one isn't
> backwards compatible.

Maybe it helps, to query the partition table by something like

`fdisk -l /dev/sda`

before mounting? This is, just to give the driver layers a chance, 'to see'
the device somehow, before accessing it 'for real'.

I have a flash reader here, which won't work otherwise. But this way it
works reliably as expected.

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 ;-)

~kurt wrote:
> Dan C <youmustbejoking@lan.invalid> wrote:
>> You may also see these terms (uhci/ehci) with the "lsmod" command, which
>> would indicate which module was loaded, which would tell you what version
>> of USB you have...
>
> This would explain why the new USB flash reader I recently bought doesn't work
> while my somewhat older one does. I guess the new one isn't backwards
> compatible.

I had a USB device that took too long to initialize or something... To
make it work, I had to
- plug it in
- wait for the device entry to appear
- unmount the device
- mount the device again

Hope that helps,
Daniel

> how much speed difference between this two specification?

# USB 1.0
12 Mbps

# USB 2.0
480 Mbps