More information:
I don't think this is a cable issue.
Pass-through DTS 5.1 works with VLC using "ALSA audio output"  [HDA NVidia: 
ALC1200 Digital (hw:0,3)] on the optical connection but not AC3. Dolby Digital 
3/2 displays on receiver but no sound. This was the exact situation with Mythtv 
some months ago before, for reasons lost to me, everything started working 
perfectly.
Not sure this is relevant, but on Mythtv audio configuration, unchecking Dolby 
Digital removes the 5.1 speaker configuration option even though DTS is still 
checked; the reverse scenario does not apply.

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https://bugs.launchpad.net/bugs/981416

Title:
  Passthrough via SPDIF stopped working

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