We can close this thread.
It is not a defect in alsa or anything else.
The main problem is the power-saving option in the intel hda module.
The sufficient fix is to modify the line in /etc/modprobe.d/alsa-base.conf
containing something like
options snd-hda-intel power_save=X
Just remove the whole power_save=X option and that's it.
Restart is required than.
** Changed in: linux (Ubuntu)
Status: New => Invalid
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[karmic] cracking sounds before sound playback
https://bugs.launchpad.net/bugs/417302
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