At the beginning I can't hear sound from headset nor use micro (neither internal one nor a connected one threw jack input)
So I created a file in /etc/modprobe.d named snd-hda-intel.conf
where I put this line (This options gives the better results)
options snd-hda-intel model=g71v
After restart every input and output is well detected in Kmix, the headset work.
I also try
options snd-hda-intel model=m51va position_fix=0
but it wasn't great at all headset and micro didn't work.
The only remained problem with the option g71v
is that I cannot capture internal micro, the external one is ok.
And I didn't find a way to make the i-mic to be selected as a capture device. One thing to notice, the i-mic half work, when talking the sound can be heard in speakers. That's really the capture mode that don't do it.
I hope I'm clear.
If someone got some clues it will be good ;-)