"After a fresh reboot sometimes Pulseaudio Volume Meter recorder shows
mic working briefly. But soon dies after a few minutes."

Looks like I found the right bug.  I also have "00:14.2 Audio device:
ATI Technologies Inc SBx00 Azalia (Intel HDA)" with an ALC262
controller.  The problem seems to be described here
http://ubuntuforums.org/showthread.php?t=1381013

and I filed a new bug here https://bugs.launchpad.net/ubuntu/+source
/alsa-driver/+bug/523953

I understand that the Karmic alsa backports package is just that, a
backport, but since Lucid will have Alsa 1.0.22.1 by default, I hope the
devs fix this issue before then.

Removing the alsa backports package and reverting to Alsa 1.0.20 solves
the issue of the mic and line-in dying after awhile, on my system at
least.

-- 
No record-signal from internal mic (Notebook, Sigmatel, HDA Intel)
https://bugs.launchpad.net/bugs/480815
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