My computer is a macbook second gen dual core.
I just upgraded to new kernel in Ubuntu Feisty: 2.6.20-16-generic #2 SMP Fri 
Aug 31 00:55:27 UTC 2007 i686 GNU/Linux

Before sound controls worked ok, only sound recording from built-in mic would 
not work.
After upgrading to this new kernel i get similar problems as described above:

I control the sound output via gnome-volume-control

- master controls treble
- front controls bass
(both put to zero mutes the sound)

- recording from front mic works!!
- recording from microphone jacked into mic outlet stopped working

- headphones no longer give sound output
  -> unless: 
    - selecting "line in as output" in the switches tab
    - using surround to control the output volume
    - jacking the headphones in the mic outlet
    - putting master and front to mute to mute the sound on the speakers 

attached my codec#0

maybe this helps you along. if you need more output, i'm happy to
help...

** Attachment added: "/proc/asound/card0/codec#0"
   http://launchpadlibrarian.net/9086619/codec%230

-- 
macbook volume control doesn't work
https://bugs.launchpad.net/bugs/102818
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