[pulseaudio-discuss] [PATCH 4/4] alsa-mixer: Add "Headphone Mic" support for 3-pin ASUS netbooks

Tanu Kaskinen tanuk at iki.fi
Thu Jun 28 09:44:19 PDT 2012

On Thu, 2012-06-28 at 16:27 +0200, David Henningsson wrote:
> Some ASUS netbooks, such as the 1015 CX, have only one 3.5 mm jack,
> but it can be used either as a headphone or as a mic (but not both
> simultaneously).
> This patch adds support for the "Headphone Mic" path that is used
> on these devices, so that we can use the jack as an external mic, and
> doing so without muting the speaker.
> BugLink: https://bugs.launchpad.net/bugs/1018262
> Signed-off-by: David Henningsson <david.henningsson at canonical.com>

The patch looks good to me, but I have a question: with this "Headphone
Mic", will the associated input and output paths always have "unknown"
as the availability state when there's something plugged in? Does alsa
provide any means to figure out which one actually is being used, and if
so, what are we missing in pulseaudio to make this work better?


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