From mboxrd@z Thu Jan  1 00:00:00 1970
From: Clemens Ladisch <clemens@ladisch.de>
Subject: Re: HDA: Sound mutes when combination is below -48 dB
Date: Fri, 03 Dec 2010 12:58:03 +0100
Message-ID: <4CF8DB4B.6060006@ladisch.de>
References: <4CF8D4BA.8080904@canonical.com>
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To: David Henningsson <david.henningsson@canonical.com>
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David Henningsson wrote:
> I'm trying to nail down a strange behaviour. I have one "Master" and one
> "Speaker" (or "Headphone") volume control, each ranging from -48 dB to 0
> dB. Whenever the sum of "Master" and "Speaker" is below -48 dB, the
> output mutes.

A known SigmaTel bug.  Does your kernel already have these patches?
http://git.alsa-project.org/?p=alsa-kernel.git;a=commit;h=de8c85f7840e5e29629de95f5af24297fb325e0b
http://git.alsa-project.org/?p=alsa-kernel.git;a=commit;h=a74ccea51d4314632a81d568d59bf885e5b09d93


Regards,
Clemens