Hi - thanks for the reply.

I tried installing linux-alsa-driver-modules-generic (24.201007620500)
from that PPA.  Rebooted.  This, unfortunately, made the problem worse:

1) neither front nor back audio jack produced sound output.
2) On opening the sound applet -> preferences, the only device shown under the 
"hardware" tab was the RS780 Azalia HDMI controller.   Previous to installing 
this package, the sound applet would list two hardware devices: the RS780 as 
above, and an "Internal audio, Analog Stereo output".   This internal analog 
device is what I had selected in order to get the front jacks to work.

I removed the package, and rebooted.  The behavior has returned as
before: no audio from the rear jack, but audio from the front headphone
jack.

Thanks for your help - please let me know if there is anything else I
can provide to help debug this.

thanks,

-K

-- 
Dell Zino - rear audio output port does not work.
https://bugs.launchpad.net/bugs/609568
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