Here's what I found:
At
http://kernel.ubuntu.com/git?p=ubuntu/ubuntu-karmic.git;a=commit;h=5f3b8f5e2b3b2d75dc76f6f870db4ea9b4062c31
It says it is fixed:
Add some tricks to reduce the click noise at powering down to D3
in the power saving mode on STAC/IDT codecs.
Also, I checked the related bug reports and my bug seems to be a
duplicate of bug 381693. Also there is some information in bug 380892.
** Package changed: linux (Ubuntu) => alsa-driver (Ubuntu)
** Changed in: alsa-driver (Ubuntu)
Status: New => Fix Released
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[9.10 regression] HDA power_save=10
https://bugs.launchpad.net/bugs/404554
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