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[Chris Lasher <chris.lasher@xxxxxxxxx>]

> Do you have sound output? Is mic your only problem?

I do have sound output, although sometimes it gets "stuck" off until I
twiddle with the volume controls (usually needing to crank the volume up
until it crackles on). The two more important issues are no mic and
noise in the headphone channel (confirmed by Nikos and Matteo above).

-- 
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