Zach... can you replicate the problem?  I am curious that even though
your problem is a bit diff (audio worked for me with DVDs only, thus s a
DD 5.1 data stream) Instead of trying your fix right away run iecset in
a terminal and post the contents... should look like this. if your
Digital Output (iec958, aka S/PDIF) is on.

Mode: consumer
Data: audio
Rate: 48000 Hz
Copyright: permitted
Emphasis: none
Category: PCM coder
Original: original
Clock: 1000 ppm

If off, then your output would look like something like this...

Mode: consumer
Data: non-audio
Rate: 48000 Hz
Copyright: permitted
Emphasis: none
Category: PCM coder
Original: original
Clock: 1000 ppm

the switch for enabling the PCM data stream is
iecset audio on
iecset audio off

I don't think this is a bug, but rather a incredibly poorly documented aspect 
of the control over the Digital Signal stream\outputs.
And we just havent ran into the Linux Audiophiles (if they are out there) than 
know and can explain the ins\outs of this in Linux.

-- 
Alsa loses AC'97 SPDIF output in Feisty
https://bugs.launchpad.net/bugs/118861
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