Comment 11 for bug 1252733

I'm sorry, but what I previously said about the detection is wrong. I guess I had some other changes around which broke it. However, I confirm that ALC668_FIXUP_AUTO_MUTE is not the solution, the subtle background noise is still there.

I would also like to add that there's a "clicking" noise when the audio card is disabled, loud enough (with my in-ear headphones at least) to make me disable the power saving mode.