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. https://launchpad.net/~diwic
