same problem for me, mother card MSI P67A-G45 (rev 3 )
 Dell 6 Series/C200 Series Chipset Family High Definition Audio 
i just upgrade to yakety yak ( ubuntu 16.10 ) same problem... audio ok in front 
jack, not in back, audio by hdmi work.
please solve !!!!

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  No Speakers Sound in Ubuntu 16.04

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