@Martin, if you use the following command to record:

pasuspender -- arecord -D plughw:Intel -f cd

...is recording still crackling?

I'm afraid we're about to run out of easy debug options - unless somebody here 
sees something that I don't. Harder debug options include
1) http://www.alsa-project.org/main/index.php/XRUN_Debug and trying to 
understand what comes out of it. 
2) Bisecting to find out what package, and ultimately commit, that is causing 
the problem. (E g running Karmic with a Lucid kernel)

-- 
crackling sound from microphone with 2.6.32-21 kernel
https://bugs.launchpad.net/bugs/572146
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