Very annoying….. after upgrading to Ubuntu 9.10 amd64 on my desktop my speakers started to crackle whenever sound needed to be played after a period of silence. It turns out with a high def soundcard the power saving feature introduced in 9.10 will cause the crackle to sound whenever the sound system is “woken up” (best way I can describe it).

To fix this edit /etc/modprobe.d/alsa-base.conf

Comment out the last line, it should look like this:
#options snd-hda-intel power_save=10 power_save_controller=N in the file /etc/modprobe.d/alsa-base.conf

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