[Gllug] What makes a USB device switch back to 1.1?

[Christian Smith]

On Sat, Jul 09, 2011 at 08:17:53AM +0100, John Winters wrote:
> And then when I plug in the HDD I get the following in /var/log/syslog
>
>
> Jul  9 08:15:12 knight kernel: [ 1070.408027] usb 1-7: new high speed  
> USB device using ehci_hcd and address 5
> Jul  9 08:15:12 knight kernel: [ 1070.568521] usb 1-7: device descriptor  
> read/64, error -71
...
> Jul  9 08:15:14 knight kernel: [ 1072.580538] hub 1-0:1.0: unable to  
> enumerate USB device on port 7
> Jul  9 08:15:14 knight kernel: [ 1072.848029] usb 5-1: new full speed  
> USB device using uhci_hcd and address 2
> Jul  9 08:15:15 knight kernel: [ 1072.972523] usb 5-1: device descriptor  
> read/64, error -71
> Jul  9 08:15:15 knight kernel: [ 1073.219468] usb 5-1: not running at  
> top speed; connect to a high speed hub
> Jul  9 08:15:15 knight kernel: [ 1073.247465] usb 5-1: New USB device  
> found, idVendor=0bc2, idProduct=3300
> Jul  9 08:15:15 knight kernel: [ 1073.247471] usb 5-1: New USB device  
> strings: Mfr=1, Product=2, SerialNumber=3
> Jul  9 08:15:15 knight kernel: [ 1073.247475] usb 5-1: Product: Desktop
> Jul  9 08:15:15 knight kernel: [ 1073.247478] usb 5-1: Manufacturer: Seagate
> Jul  9 08:15:15 knight kernel: [ 1073.247481] usb 5-1: SerialNumber:  

So, there is some incompatibility between the controller and the device.

Certainly doesn't look like a duff port or wiring.

This may help:
http://urukrama.wordpress.com/2009/01/27/usb-drive-not-recognised-error-71/

This link also includes a description of why the problem occurs:
http://www.spinics.net/lists/usb/msg02644.html

As usual, it's Microsoft's fault :)

HTH,
Christian
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