Re: high-speed usb doesn't work

[Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>]

On Mon, 3 Dec 2007, David Griffith wrote:

> I'm running 2.6.22, specifically Ubuntu Gutsy.  When I plug in a usb 2.0
> masss storage device, I get this in dmesg:
> 
> [ 131.646942] usb 2-3: new high speed USB device using ehci_hcd and address 5
> [ 131.758810] usb 2-3: device descriptor read/64, error -71
> [ 131.974536] usb 2-3: device descriptor read/64, error -71
> [ 132.190286] usb 2-3: new high speed USB device using ehci_hcd and address 6
> [ 132.302148] usb 2-3: device descriptor read/64, error -71
> [ 132.517889] usb 2-3: device descriptor read/64, error -71
> [ 132.733653] usb 2-3: new high speed USB device using ehci_hcd and address 7
> [ 133.141157] usb 2-3: device not accepting address 7, error -71
> [ 133.253029] usb 2-3: new high speed USB device using ehci_hcd and address 8
> [ 133.660542] usb 2-3: device not accepting address 8, error -71

These are low-level hardware errors.  Maybe in the device, maybe caused 
by the USB cable, maybe in your EHCI controller.

Some tests to try:

	Does the device work at high speed in a different computer?

	Does it work in other ports on your computer or with a different
	USB cable?

	Do other high-speed devices work on your computer?

> The drive does not appear to be recognized, nor does /dev/bus/usb/devices
> say anything about it. If I do "modprobe -r ehci_hcd", the drive is
> recognized as a USB 1.1 device. Not surprisingly, the throughput is a
> horrid 1 megabyte per second or worse. This problem seems to crop up a lot
> and then the bug report is closed when the problem mysteriously vanishes.
> For example
> https://bugs.launchpad.net/ubuntu/+source/linux-source-2.6.15/+bug/52551

Go back and look at that bug report again.  It had "error -110", not 
"error -71".  The two are very different.

Alan Stern


-------------------------------------------------------------------------
SF.Net email is sponsored by: The Future of Linux Business White Paper
from Novell.  From the desktop to the data center, Linux is going
mainstream.  Let it simplify your IT future.
http://altfarm.mediaplex.com/ad/ck/8857-50307-18918-4
_______________________________________________
Linux-usb-users@xxxxxxxxxxxxxxxxxxxxx
To unsubscribe, use the last form field at:
https://lists.sourceforge.net/lists/listinfo/linux-usb-users