exactly the same problem on toshiba p100-PSPAGE with Conexant CX20549 (Venice).
Sound worked on gutsy with acpi=off.
Now works out of the box, both when no headphones! tried all possible tweaks to 
alsa-base with 
snd-hda-intel option=toshiba
snd-hda-intel option=3stack
....

nothing seems to work.

If I plug the headphone jack only half the way in I can year the sound.
When it's completely inserted the sound disappears!

Nothing muted on alsamixer.

Any clues?

Thanks!

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Toshiba p100 Conexant CX20549 (Venice) Headphone jack not working
https://bugs.launchpad.net/bugs/218817
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