Workaround: plug in headphones in the front panel and the internal speaker will 
mute. I believe that's not how it should work and there's probably a regression 
in one of the drivers.
There is a similar thread here, although the focus there is on sound via HDMI:
http://ubuntuforums.org/showthread.php?t=1604484
(their fix involves updating ALSA)

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Internal speaker still on when external speakers plugged in 
https://bugs.launchpad.net/bugs/637520
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