I found out that running IECSET in a terminal window will give you the status 
of your PCM data stream.
here is my results, pay close attention to the Data results...

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

If after running IECSET yours says Data: Non Audio,
run iecset audio on to get all your PCM sources to play via SPDIF.

In my case, after playing a DVD the only audio available through SPDIF
was DVD's.  I figured out that since my amp no longer switched to PCM
when playing music and other 2 channel sources that there was something
changed in the digital data stream.

After running iecset audio on, all my 2 channel sources play through
SPDIF again and the amp now switches to PCM when I do.

Hope this helps some of you... I'm running Intrepid Ibex.

-- 
SPDIF won't play PCM after playing AC3
https://bugs.launchpad.net/bugs/25632
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