you need to open gedit as the admin in order to save changes to alsa-base.conf
Enter following command in TERMINAL: sudo gedit /etc/modprobe.d/alsa-base.conf
then add the following line and save changes:
options snd-hda-intel model=thinkpad
or
options snd-hda-intel model=laptop
Another success getting headphone sense jack capability to reactivate on an CF-52 semi-rugged running 12.10 32-bit. No need to goof around with alsa-mixer, adding the model=thinkpad line now shuts off laptop speakers when inserting headphones. Will try the model=laptop flavor also to see if that works also.
Try this post for more detail about what's going on with the alsa.conf in this matter:
http://ubuntuforums.org/showthread.php?t=1043568
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