I have an odd scenario. After building Gentoo Linux's 2.6.29-r1, using "alsamixer" I can get my microphone's sound to be played back to me, but I cannot get sound recorder to record any sound from it. In fact, upon opening sound recorder, it mutes the microphone and tries to set sound to use "aux" as the input. Going into File->Sound Control shows a muted Microphone, and changing any of the setting in this window does not stick through closing and re-openning it. I'm not entirely certain where to look on this one.

Hi,
I had the same problem and solved like this:
1) open alsamixer;
2) press "tab" to switch to capture;
3) press "bar" on the first capture channel;
"L_____R" red sign should appear;
4) select by arrow key MIC as the source of the first
input source;
2) record a test file:
arecord -f cd -D hw:0,0 -d 10 test.wav
play it back to test i.e.:
mplayer test.wav

This way I got skype microphone working again on hw:intel.0

Cheers,
Pier

Linux localhost 2.6.29-gentoo-r1 #3 SMP Wed Apr 22 22:42:08 CEST 2009 i686 Intel(R) Core(TM)2 Duo CPU T8300 @ 2.40GHz GenuineIntel GNU/Linux

dmidecode | grep Mac
Product Name: MacBook4,1
Family: MacBook
Product Name: Mac-F22788A9
Version: Mac-F22788A9

lspci | grep Audio
00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio Controller (rev 04)

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Pressing space in alsomixer doesn't do much for me. No "R". Here's arecord:

and `lspci`

hi

not sure what DE/WM you use but see if creating a sound config file helps with info from your codec

see my signature...sorry you will need to read at least the alsa config stuff and its source for knowing what to put in there

if you care to