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Date: Mon, 16 Jun 2014 17:30:32 +0200
From: Hans Petter Selasky <hps@selasky.org>
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To: Matthias Apitz <guru@unixarea.de>
Subject: Re: Fwd: USB to parallel for printer HP LaserJet 4mL
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On 06/16/14 17:10, Matthias Apitz wrote:
> El día Monday, June 16, 2014 a las 12:10:41PM +0200, Hans Petter Selasky escribió:
>
>> What happens if you revert that patch, and do a read first, instead of a
>> write?
>
> I have revert both patches, i.e. the code is now as it was, but has some
> DPRINTF statements at the beginning of the fuctions; here is what
> happens on plug-in, read and write to the device:
>
> plug-in USB cable:
>

Test1)
Can you try to connect an external High-Speed HUB in between?

Test2)
Instead of ulpt.debug, set hw.usb.uhub.debug=15 and collect logs, when 
executing your "echo XXX > /dev/ulpt".

--HPS