With the parameter model=w2jc, current versions of alsa are confirmed to
work partially.

Speakers and Mic work, the LineIn can be reconfigured to LineOut via the
'Channel' setting in the mixer. Headphones do however not work. With
model=macpro or autodetection, the headphone output is *very* silent
when all controls are at max.

realtek_patch.c from the alsa distribution needs to be adjusted. The
correct PINs for the headphone mixer controls are needed.

-- 
Sound volume too low on MacBook Pro (Rev. 3 Santa Rosa) and Gutsy
https://bugs.launchpad.net/bugs/125332
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