[pulseaudio-discuss] [PATCH 0/5] No more dual-direction ports.
david.henningsson at canonical.com
Tue Apr 17 08:34:51 PDT 2012
2012-04-17 16:48, Mark Brown skrev:
> On Tue, Apr 17, 2012 at 04:29:01PM +0200, David Henningsson wrote:
>> For desktops / HDA, we only have single-direction ports so far, and
>> I don't see that changing in the foreseeable future, so not much to
>> worry about there.
> This is definitely *not* true - as I have repeatedly pointed out all the
> Apple hardware has headset jacks that are compatible with the iDevice
> headsets. See the recent thread from Kevin Hillman on alsa-devel...
I know that there is plenty of Apple (and Lenovo etc) hardware that have
4-pin headset jacks. I also know that for all such hardware that I've
seen, the input and output paths are separated at the codec level - the
mic pin node and the headphone pin node is separate, and they have
separate jack detection. There is no way we can figure out, from
reading/parsing the codec configuration, whether this is a 4-pin jack or
this is one separate headphone jack and one mic jack physically.
Therefore, the 4-pin jacks show up as two different ports, one for
headphone and one for mic. They are both single-direction ports, and
thus, my original statement is true.
David Henningsson, Canonical Ltd.
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