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[Alex Murray <murray.alex@xxxxxxxxx>]

Output from alsa-info.sh script run on my MacBook Pro 5,1 running Ubuntu
8.10 Intrepid:

http://www.alsa-
project.org/db/?f=247450a1667370684d30c31008d124f15c8f3a19

Note: Under Intrepid ONLY the headphones work, I cannot get any sound
output from the speakers at all.

-- 
Left speaker doesn't work, controls mixed up on Apple MacBook[Pro] (5,1)
https://bugs.launchpad.net/bugs/337314
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Status in ALSA driver: Unknown
Status in Mactel Support: New
Status in “alsa-driver” source 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