How to most easily reproducce and verify the audio crackling:
1) Start gstreamer-properties and do a sound test. This produces a sound which 
very easily reveals crackling.
2) Fire up a web browser and watch a Youtube video in fullscreen with Flash 
plugin (low volume).
3) Listen to the sound of pop corn popping.

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Thread [hd-audio0] consuming excessive amounts of CPU, audio crackling
https://bugs.launchpad.net/bugs/571770
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