I have the same laptop. Installing newer alsa-drivers or the headphone
hint do not help. A workaround is the following:

I. install hda-verb. 
1. wget 
http://ftp.kernel.org/pub/linux/kernel/people/tiwai/misc/hda-verb/hda-verb-0.3.tar.gz
2. cd hda-verb-0.3
3. make
4. sudo cp hda-verb /usr/local/bin

II. install this script: http://hup.pastebin.com/f5ac554d4
1. sudo wget "http://hup.pastebin.com/pastebin.php?dl=f5ac554d4"; -O 
/usr/local/bin/hp-toggle.sh
2. sudo chmod +x /usr/local/bin/hp-toggle.sh

Running 'sudo hp-toggle.sh' from console mutes the active sound output
and switches to the other. If both are active, the speakers are muted.
This is not exactly the same as found at http://digitizor.com/2009/10/22
/fix-headphone-sound-problem-hp-laptop-linux/ but based on it, since
that doesn't work with this card.

Optional convenience steps:
III. create icon on desktop with the command "gksudo hp-toggle.sh", drag in 
onto a panel if you like.

IV. don't require a password for switching outputs.
1. sudo visudo
2. add line: %admin ALL=NOPASSWD:/usr/local/bin/hp-toggle.sh
3. save.

-- 
When headphones are plugged in, the speaker does not get muted automatically.
https://bugs.launchpad.net/bugs/477154
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