> With the beta livecd, the mic worked fine without tweaks.

Wow, finally somebody who can reproduce my problem! I guess we will form
a bigger group after the final has been released ;)

I'd love to know what makes the difference between the live and
installed system. Obviously a working configuration is destroyed during
installation but I have no clue how or why that happens... I've tried to
figure that out with some help from Colin from the PA mailing list but
there simply was no difference in PA and ALSA setup (except for "flat
volumes" being disabled in the live session). I've also filed a report
tot he ALSA dev and user list but got no response. Unfortunately, I
cannot do more tests because it wasn't my machine and I had to give it
back to its owner. But if you'd like to do more research, here are some
commands that may help:

For debugging, use the output of "amixer -c0", "pacmd list" and the "als-info" 
script that you can find here:
http://www.alsa-project.org/main/index.php/Help_To_Debug

If it's of any help for you, here is my conversation with Colin on the PA list:
https://tango.0pointer.de/pipermail/pulseaudio-discuss/2009-September/005031.html

Good luck!

-- 
Recording from microphone stutters when pulseaudio is running
https://bugs.launchpad.net/bugs/354620
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