On Tue, 20 May 2014, Heinz Diehl wrote:

> On 20.05.2014, Heinz Diehl wrote: 
> 
> > The usbmon dump of the whole process is here:
> > http://www.fritha.org/usblog.zip
> 
> And here's another one, while popping in and out.
> http://www.fritha.org/usblog2.zip

Nothing very informative stands out in those files.  In the first one, 
the device was in a weird state, where it wouldn't transfer data over 
the bulk endpoints, and resetting it didn't help.  In the second file, 
the device spontaneously got disconnected shortly after it was plugged 
in, but it started working correctly after a few resets.

Your problems were probably caused by those spontaneous disconnects.
They could be caused by a small electrical incompatibility between the 
computer and the device.

Alan Stern

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