n-trig pen with evdev drivers - Sony Vaio Duo 11

[Carlo Nucera]

Hi,
I have some problems setting up the active digitizer of my Sony Vaio
Duo 11: in particular, one of the buttons is seen by the kernel, but
not picked up by `xinput test`.
This makes impossible to use that button, eg, in xournal.

To avoid information duplication, I provided a detailed rundown of
what I tried, and more information, at http://goo.gl/nJpfJR
If you have other questions, I'll be happy to answer.

Thanks
Carlo Nucera