I am also experiencing this issue with Jaunty installed on a Compaq Mini
110c. Very frustrating.

The issue started randomly after the system automatically shut down
because of a low battery. After plugging the machine in for AC power and
booting up, I found that I had no sound! Soon after I realized I got
playback only through the headphone jack.

Similarly to Kensan's experience, this occurred sometime after the
kernel upgrade.

I also noticed that the "Front" and "Headphone" volume controls are
broken. They both alter the volume of sound playing through the
headphones, and they also interfere with one another. Adjusting the
Front volume after adjusting the Headphone volume causes a sharp
increase in volume, even if it is adjusted back to its original value.

No fixes I've tried work. I noticed that 'alsa force-reload' causes the
speakers to briefly pop, but there is still no playback through them.

-- 
sound only through headphones intel audio in Jaunty
https://bugs.launchpad.net/bugs/349633
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