Sarah Sharp <sarah.a.sharp@...> writes:

> 
> Hi Mark,
> 
> Your device sounds really really flaky.  There doesn't seem to be a
> consistent failure mode, and the errors aren't repeatable.  I'd actually
> suggest you return the device and get a different brand.  If the device
> fails to enumerate now like this, who knows how stable it will be in the
> future?
> 
[snip]
> 
> -71 is -EPROTO, which means there was a transaction error on the Set
> Address command.  Have you tried swapping the USB 3.0 cable for a new
> cable?  Perhaps a bad cable is introducing noise in the first few
> transfers?

This might add some weight to the noise hypothesis ...

I have a GIGABYTE GA-990FXA-UD5 motherboard with similar problems.  It
uses the Etron EJ168 chips and there are USB 3.0 connectors on the
rear panel. 

It also has a header on the motherboard to which I have
connected a Y USB 3.0 cable then plugged in the USB lead that came
with the case into the one socket of the Y.  This then patches the
cable to the top of the front of the case.  I was having problems with
this socket with the prolific USB bridge as well as a Samsung 2.5 inch
USB 3.0 HD.

When I switched to the rear panel connectors (much more direct) the
samsung and the prolific kit both work.



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