Fwd: USB to parallel for printer HP LaserJet 4mL

[Hans Petter Selasky]

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