[alsa-devel] [PATCH] ALSA: hda: Add speaker pin to automute Acer Aspire 8943G

David Henningsson david.henningsson at canonical.com
Thu Oct 14 09:49:07 CEST 2010

On 2010-10-14 08:13, Valentine Sinitsyn wrote:
> Hi David,
> First of all, thank you for your work on subwoofer issues. I've had a
> chance to test them on my system lately, and they do really fix the bug
> reported, but another one (more serious, in my opinion) remains:
> subwoofer is not muted via normal mute button (more precisely, by muting
> Master ALSA mixer). The problem is that during autoconfiguration
> procedure, subwoofer is mapped on PCM channel, and there seems (at least
> to me) to be no reliable way to distinguish subwoofer from other
> possibly existing outputs on a general system and change this behavior.
> Creating dedicated presets for the machines with a subwoofer seems to be
> right way to workaround this, but then _quirks you've implemented should
> be merged with this preset.
> Does this sound reasonable to you or I am missing anything?

I would say that advertising this pin correctly to the driver is the 
first step. Trying to make the auto-parser treat this pin better would 
be a second step, separate from this patch. Making a new model (if that 
is what you call a "preset") would work as well, and might be easier for 
this particular case, while improving the auto-parser would be better in 
the long run.

Do you agree?

David Henningsson, Canonical Ltd.

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