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[Alex Murray <murray.alex@xxxxxxxxx>]

I can also confirm that it pretty much works - in that I now get sound
from the left speaker finally but overall the sound seems more tinny -
ie. has a lot less bass and is more treble-y  - is there some difference
between what the new mb5 model uses and the old mbp3 model which may
have affected this? Does anyone else also think this is the case or is
it just me?

-- 
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: Confirmed
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