I have tested switching 'IEC958 Default PCM' in alsamixer.  But it has no 
noteable effect for me. 
* mplayer playes ac3 in both positions 
* aplay does not play in both positions 
* PCM soud is working from any player in both positions 

About the possible index=16 conflict: 
It seams all  'IEC958' controls are working as desired. 
I can mute PCM and AC3 sound with the 'IEC958' control of PCH. 
Both 'IEC958' switches of the MID are not effecting the output of PCH.

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https://bugs.launchpad.net/bugs/1264609

Title:
  No AC3 paththrough with hda intel ALC887-VD Saucy

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