On 06/01/14 19:58, Matthias Apitz wrote:
El día Sunday, June 01, 2014 a las 07:44:51PM +0200, Hans Petter Selasky 

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


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



Rebuild and install the module.

Set hw.usb.ulpt.debug=15

Look for errors.


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