To solve the Lenovo Thinkpad X200 audio problem, you have to know first that it is equipped of Intel Corporation 82801I (ICH9 Family) HD Audio Controller (rev 03).
Following this steps solved my problem:
1. type in terminal.
gksu gedit /etc/modprobe.d/alsa-base
2.add the following to the end of the file
options snd-hda-intel enable_msi=1
I hope that helps somebody.