how to judge the usb interface is 1.0 or 2.0

guduke · 01-24-2006, 07:34 AM

Hi, everyone:
who can tell me how to judge the usb interface is 1.0 or 2.0,and how to judge the os whether or not support usb2.0, mu os is redhat as 4 (update 2 ).
Thanks!

bigrigdriver · 01-24-2006, 08:13 AM

lspci will tell you the revision number of your USB controller.

It should show you something like this:
0000:00:04.2 USB Controller: Intel Corporation 82371AB/EB/MB PIIX4 USB (rev 02)

The (rev 02) tells you it's USB 2.0.

Bebo · 01-24-2006, 08:46 AM

Ah, then what does this mean (from my 4 years old desktop):

00:1f.2 USB Controller: Intel Corporation 82801BA/BAM USB (Hub #1) (rev 04)

USB 4?

Sorry, bigrigdriver, don't mean to make fun of you, I'm actually quite interested in this question too.

I think lsusb shows what USB version your controller(s) support, but I myself don't know what to look for.

Bebo · 01-24-2006, 09:06 AM

Aha, I think I'm on to something. On the Gentoo Linux USB Guide it ways that one should look for "EHCI" in the lspci USB Controller output, i.e.

Code:

00:1d.7 USB Controller: Intel Corp. 82801DB USB EHCI Controller (rev 01) (prog-if 20 [EHCI])

Also, I noticed that /proc/bus/usb/devices contains useful information, like this:

Code:

T:  Bus=02 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#=  1 Spd=12  MxCh= 2
B:  Alloc=  0/900 us ( 0%), #Int=  0, #Iso=  0
D:  Ver= 1.10 Cls=09(hub  ) Sub=00 Prot=00 MxPS=64 #Cfgs=  1
P:  Vendor=0000 ProdID=0000 Rev= 2.06
S:  Manufacturer=Linux 2.6.15.1 uhci_hcd
S:  Product=UHCI Host Controller
S:  SerialNumber=0000:00:1f.4
C:* #Ifs= 1 Cfg#= 1 Atr=c0 MxPwr=  0mA
I:  If#= 0 Alt= 0 #EPs= 1 Cls=09(hub  ) Sub=00 Prot=00 Driver=hub
E:  Ad=81(I) Atr=03(Int.) MxPS=   2 Ivl=255ms

The only instances of the string "1.10" in the output from lsusb -v on my machine are on the lines with "bcdUSB" and "bcdHID", so by induction we can conclude that this is what to look for.

Or not, I don't know

Can someone confirm this?

(BTW, my desktop is so old so it should not support 2.0, that's why I'm only looking for 1.1 here.)

amosf · 01-24-2006, 09:10 AM

00:02.0 USB Controller: nVidia Corporation CK8S USB Controller (rev a1)

USB a1

guduke · 01-24-2006, 06:36 PM

Thanks everyone , I learn much from your answears. Personally, I think bebo's answeare is best. Any others have different opion or answear,welcome anytime. Thanks again ! Let us make progree toghter!!