I have done the following things but all of them doesn't resolve the problem 
fully:
- options snd-hda-intel power_save=10 power_save_controller=N is commented out 
in /etc/modprobe.d/alsa-conf
- pulseaudio-dev PPA didn't help so i reverted back to the original pulseaudio 
packages with apt pinning
- i installed kernel 2.6.32, that did not help so i reverted back to 2.6.31
-  /etc/pulse/daemon.conf : uncommented the line enable-lfe-remixing=yes -> now 
the subwoofer is working again, but the high noise is not gone

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Highpitched Rattling like Sound with 5.1 Surround Configuration on Karmic Koala
https://bugs.launchpad.net/bugs/445849
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