I am confirming this on my Toshiba P105-S9339 with fresh Karmic
installed.

00:1b.0 Audio device: Intel Corporation 82801G (ICH7 Family) High
Definition Audio Controller (rev 02)

Changing alsa-base.conf does NOT resolve the issue--or at least not
permanently. When I got home from work today, the pop/click was back and
/sys/module/snd_hda_intel/parameters/power_save held the value of 10.

If I enter a root terminal, I can 'echo 0 >
/sys/module/snd_hda_intel/parameters/power_save' to obtain some relief.
(sudo does not work for this--I get a permission denied. I've not yet
checked to see if this is a sudo configuration issue or a /sys issue).

-- 
snd-hda-intel powersave option and "CLICK" from speakers
https://bugs.launchpad.net/bugs/381201
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