I was just introduced to this issue in karmic when starting openarena. I
can only describe the sound as high pitched bells.
Commenting out the following line in /etc/modprobe.d/alsa-base.conf has
resolved the issue for me:
options snd-hda-intel power_save=10
================
Info about what I'm running:
================
Linux karmic 2.6.31-10-generic #32-Ubuntu SMP Thu Sep 10 23:33:50 UTC 2009 i686
GNU/Linux
Description: Ubuntu karmic (development branch)
Release: 9.10
00:1b.0 Audio device [0403]: Intel Corporation 82801H (ICH8 Family) HD Audio
Controller [8086:284b] (rev 02)
Kernel driver in use: HDA Intel
Kernel modules: snd-hda-intel
Codec: SigmaTel STAC9271D
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karmic: high-pitched noise from snd-hda-intel
https://bugs.launchpad.net/bugs/382140
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