there are two ports for ac97 codecs (eg. ad1985) without headphone
volume control

                analog-output;output-amplifier-on:
                                
                analog-output;output-amplifier-off:
                                

https://launchpadlibrarian.net/106662599/PulseList.txt


so this is clearly a bug which introduced by colin's patch which remove the 
analog output as it is a subset of headphone

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https://bugs.launchpad.net/bugs/1033996

Title:
  [IBM 818946G, AD1981B (AC97), playback] No sound at all

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