I've found a workaround for this issue:
http://forums.gentoo.org/viewtopic-p-4291307.html?sid=2d09aabef90429f5465f9ee35f12456e#4291307
Specifically, setting the playback mode under System->Preferences->Sound
to "ALSA - Advanced Linux Sound Architecture" instead of "AD198x Analog"
and creating setting up /etc/asound.conf as follows:
pcm.upmix_4ch {
type plug
slave.pcm surround40
slave.channels 4
route_policy duplicate
}
pcm.default upmix_4ch
Unfortunately, this has the side effect of restricting me to a single
application using audio at any given time, but will have to do until
ALSA bug #2889 is fixed.
--
High pitch whine on left audio channel with Asus K8N-VM
https://bugs.launchpad.net/bugs/156540
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