Adding solution posted in bug #268301 originally:

>The instructions I've placed at 
>https://help.ubuntu.com/community/MacBook?#Microphone work for me on my 
>MacBook 4,1 on Intrepid. Can others comment if those instructions work for 
>them on their hardware? (Comment only if the hardware is not mentioned in a 
>previous comment or if your experience differs from that of a previous comment 
>to keep the bug comments tidy please).
>
>So at least for the Macbook 4,1 it seems like it is just some default settings 
>that need to be changed. I'm not sure what package/software is responsible for 
>detecting and enabling the relevant settings changed in the wiki.

Here are the instructions:
1. Open Volume Control by right clicking on the volume icon and selecting "Open 
Volume Control".
2. Click on Preferences and enable Capture, enable Mic Boost, and then close 
Preferences.
3. In the Recording tab of Volume Control, raise the Capture level.
4. In the Playback tab of Volume Control, raise the Mic Boost level.
5. Test by running gnome-sound-recorder. Ensure that "Capture" is selected in 
the "Record from input" dropdown. 

Jens-Christian Lache added:
> In "Audiosettings", I also had to set the recording source to "HDA Intel 
> ALC885 Analog (ALSA)" for Audioconferencing.

-- 
Build-in Mic on MacBook 4,1 does not work
https://bugs.launchpad.net/bugs/289552
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