I use the VT1708S codec as well. The "Headphone" mixer in alsamixer is
grayed-out for me, too. However, the headphones do work, sort of.
Whenever I plug in my headphones, the "Front" mixer mutes and no sound
is played through either the built-in speakers of my laptop or the
headphones. When I unmute the mixer, both the speakers and the
headphones play sound.

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[VIA VT1708S] ALSA test tone NOT correctly played back for headphone but works 
fine for speakers
https://bugs.launchpad.net/bugs/607482
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