Another MBP 5.2 owner here, using Debian unstable with legacy bios boot,
amd64, alsa-driver 1.0.20 and patch posted above.

I did not get pulseaudio to work and I commented out the stuff in
/etc/asound.conf again. My left+right HP speakers both work fine anyway.
However,

- I also have the noise reported by Chris Lasher above, even though mic/line 
are muted and gain is minimal.
- The PCM and Master controls only work for speakers, not for HP.
- With mpd, I have to reduce the gain of the HP to about 0% to be comfortable, 
and 20 is pretty loud already. Using alsamixer, all other settings muted or 0%
- With mplayer, loudness-levels seem more normal. PCM mixer works. Both, mpd 
and mplayer are run with alsa. However, I can not unload snd_mixer_oss, that 
might be the culprit here..

Did you compare to PIN settings in windows?

** Attachment added: "proc/asound/card0/codec#0"
   http://launchpadlibrarian.net/29421090/alsa.mine

-- 
Left speaker doesn't work, controls mixed up on Apple MacBook[Pro] (5,1)
https://bugs.launchpad.net/bugs/337314
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