Re: System hangs when using USB 3.0 HD with on Ubuntu

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On Wed, 24 Mar 2010, Sarah Sharp wrote:

> On Wed, Mar 24, 2010 at 10:11:43AM +0100, Jonas Schwertfeger wrote:
> > That additional USB debug flag did it. Attached is the kern.log file.
> 
> Your log file shows a repeating pattern, but I'm not sure why it would
> lead to a system freeze.  What happens is the device responds to a bulk
> transfer with a stall.  You would have to enable USB mass storage
> debugging (CONFIG_USB_STORAGE_DEBUG) to see which command the drive
> doesn't like.

You can get even more detailed information by using usbmon.  See the 
instructions in Documentation/usb/usbmon.txt.

Alan Stern

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