Public bug reported:
It seems to be enabled per default since Karmic but while the power
saving should be minimal every time the sound output is used a loud
clicking noise is released. If you use headphones you can really getting
deaf through it and I am pretty sure that this isn't beneficial for the
speakers also.
I am using an Intel sound card but I guess other devices may also be affected.
00:1b.0 Audio device: Intel Corporation 82801JI (ICH10 Family) HD Audio
Controller
snd_hda_intel
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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Please disable Kernel sound power saving per default [Karmic]
https://bugs.launchpad.net/bugs/391182
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