After some googling I found this workaround: 
http://art.ubuntuforums.org/showpost.php?p=9298037&postcount=6
Instead of modifying modprobe.conf I edited alsa-base.conf, and after fiddling 
around in sound controls and plugging and unplugging the headphone jack I got 
them to work.

Still, it shouldn't be fixed this way.

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82801I (ICH9 Family) HD Audio Controller - Lucid Lynx - Headphone jack does not 
disable speakers on laptop
https://bugs.launchpad.net/bugs/565685
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