Comment 116 for bug 445849

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ArchLight (bothachristoff) wrote : Re: Highpitched Rattling like Sound with 5.1 Surround Configuration on Karmic Koala

I was able to stop the ringing in my 5.1 setup by running alsamixer in terminal and pushing the volume on all channels to 100.
As soon as I fiddle with any volume controls in the Sound preferences window, the ringing starts again. I control volume on my speakers now and it does not ring at all.