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Message-ID: <538B6C4F.9050205@selasky.org>
Date: Sun, 01 Jun 2014 20:09:19 +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
References: <20140601130025.GA2255@La-Habana> <538B6693.5010108@selasky.org>
 <20140601175846.GA2104@La-Habana>
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On 06/01/14 19:58, Matthias Apitz wrote:
> El día Sunday, June 01, 2014 a las 07:44:51PM +0200, Hans Petter Selasky escribió:
>
>> What does:
>>
>> usbdump -i usbusX -f Y -s 65536 -vvv
>>
>> Outpu when you run the cat?
>
> Attached the output of
>
> # usbdump -i usbus1 -f 2 -s 65536 -vvv > usbdump.txt
>
> while running in another xterm
>
> # date > /dev/unlpt0
>

Hi,

The trace shows that the device is not responding to a control request, 
which is the port status control request. This is a violation of USB.org 
ULPT standards.

Are you sure your device is genuine, hence the wrong spelling of 
"Prolific" ?

Try compiling the ulpt module with USB_DEBUG set:

ee /sys/modules/usb/ulpt/Makefile

ADD:

CFLAGS+= -DUSB_DEBUG

Rebuild and install the module.

Set hw.usb.ulpt.debug=15

Look for errors.

--HPS