Installed a fresh copy of Jaunty beta on my machine, with no updates
except for the installation of the nvidia driver.

Fresh alsa-info.sh output here: http://www.alsa-
project.org/db/?f=03d229143b86b0328b0e3ece8426099e5348dc53

To make sound come out of the headphones, I must go into gnome-volume-
control and unmute "Surround" (this has to first be added via
Preferences > check the Surround box).

To turn off the internal speakers, I have to mute "Front" in gnome-
volume-control.

The "Headphone" checkbox in the "Switches" tab has no effect on
headphone playback.

I'd be happy to do whatever needs to be done to resolve this issue,
thanks!

-- 
Acer Aspire 4530 headphones do not work when plugged in, also doesn't mute 
speakers
https://bugs.launchpad.net/bugs/360181
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