Hi Greg,

Gregs git-bot wrote:

> commit: 3868137ea41866773e75d9ac4b9988dcc361ff1d
> From: Takashi Iwai <[email protected]>
> Date: Mon, 27 Feb 2012 15:00:58 +0100
> Subject: ALSA: hda - Add a fake mute feature
[...]
> This patch adds an extension amp-cap bit (which is used only in the
> driver) to represent the min volume = mute state.  Also modified the
> amp cache code to support the fake mute feature when this bit is set
> but the real mute bit is unset.
>
> In addition, conexant cx5051 parser uses this new feature to implement
> the missing mute controls.
>
> Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=42825

Symptoms:

 Without this patch, S.G. (cc-ed) noticed that pulseaudio's "mute"
 feature had no effect.  This was a regression: v3.2.6 reproduced the
 bug, while v3.1.8 did not.

Testing[1]:

 Applying the patch to v3.2.6 fixed it:

  Tested-by: S. G. <[email protected]> # 3.2.y, CX20561 on ThinkPad T500

Applicability:

 Patch applies to 3.2.y.  Earlier kernels don't need it.

Hope that helps,
Jonathan

[1] https://bugzilla.kernel.org/show_bug.cgi?id=42825#c12
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