hi there,
on debian squeeze(testing) same issue here.
sysinfos: asus k42jv, 2.6.32 amd64 kernel, 1.0.23 alsa., codec ALC259

i found out that you have to make following changes with hda analyzer
to mute notebook speakers and get headphone sound:
        - Node[0x14] PIN ->   Val[0] + Val[1] ->      mute
        - Node[0x1a] PIN ->   Connection List ->   Audio Mixer [0x0c]

0x14 is the speakers trigger and 0x1a 
for headphones.

is there a way to apply these changes script based on system boot?

-- 
No Sound From Headphones - ASUS K42JV
https://bugs.launchpad.net/bugs/604771
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