Under Fedora 14 which I realise may not be called for here, I have the
same problem, however, after removing PulseAudio, and using alsamixer
under terminal, the problem is non existent.

Under alsamixer:

Headphones - No effect on either headphone jack or internal speakers
Front - Seems to control the sound coming out of both outputs, however, stays 
muted or sound will come out of both outputs

Independent is Off - If on, no sound comes out of the headphone jack.

Hope it helps someone.

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https://bugs.launchpad.net/bugs/565685

Title:
  [Asus K50IJ] Lucid Lynx - No automute (Headphone jack does not disable
  speakers on laptop)

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