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Re: usb2 from debian distribution kernel

On Mon, Jan 02, 2006 at 11:58:46PM +0100, Wolfgang Mader wrote:
> I have installed the debian distribution kernel (2.6.14-2) and I have attached 
> an usb2 harddisk to an usb2 port on my linuxbox (sounds good till here).
> Now I want to know how to check if my computer uses usb2.
> The problem is that there is a really bad transmisson rate to the harddisk 
> (about 1 mb/s) and I am not sure where to start searching.

Check the kernel log (from dmesg, or /var/log/kern.log). When the device
is first attached you should see something like these:

usb 3-5: new high speed USB device using ehci_hcd and address 27

usb 2-1: new full speed USB device using ohci_hcd and address 18

"high speed" means USB 2.0, "full speed" means USB 1.1.
I think there is also half speed 1.1.

Alternatively, while the device is plugged in run "lsusb -v" and look at
the "bcdUSB" field which seems to indicate 1.10 or 2.00.

Hamish Moffatt VK3SB <hamish@debian.org> <hamish@cloud.net.au>

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