I should note that with this patch, the model option is imac91, which is
automatically detected if /proc/asound/card0/codec#0 contains Subsystem
Id: 0x106b4900

I should also note, that in my case, there was no sound at all, either
from the headphone jack or the built in speakers.  I'm guessing sound
from the headphone jack would have worked in Intrepid and possibly
earlier versions of Jaunty, since I believe those versions of alsa did
not contain the clause for this model to use the 883/888 alc.  882/885
alc is required.  One can tell which is being used by the output of
aplay -l

-- 
New iMac (9,1, March 09) headphone jack works, speakers do not
https://bugs.launchpad.net/bugs/346170
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