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[pepe <sf@xxxxxxxxxxxxxx>]

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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Support, which is the registrant for Mactel Support.

Status in ALSA driver: Unknown
Status in Mactel Support: Confirmed
Status in “alsa-driver” package in Ubuntu: New

Bug description:
Reporting this bug for another user...

In MacBook and MacBookPro 5,1 (aluminium, late 2008) the soundcard works out of the box only with headphones, and to turn speakers on it is necessary to manually set the 6 channels. In that case, sound is heard both on headphones and right and center speaker; the left speaker doesn't work yet.

This bug is confirmed by several users, see the additional information attached.

della@raker:~$ lspci | grep -i audio
00:08.0 Audio device: nVidia Corporation MCP79 High Definition Audio (rev b1)
della@raker:~$ grep Codec /proc/asound/card0/codec#*
Codec: Realtek ALC889A