Posting this to alsa-devel without being actually sure it belongs here,
so please do tell if it belongs elsewhere. But here goes:
If you have e.g. a Bose QC25 headset (wired, not bluetooth) in Linux,
you can't get the volume buttons nor the play/pause button on the
headphone cable itself to work. As far as I know, these buttons works in
both Android and Windows 10, so it would be nice if they would work with
plain Linux too.
This StackExchange thread discusses how it works:
https://electronics.stackexchange.com/questions/242883/how-do-media-buttons-on-a-plain-wired-headset-work
As one poster on StackExchange mentions, Android has a defined standard
on these kind of buttons:
https://source.android.com/devices/accessories/headset/plug-headset-spec
Since these kind of button presses must be decoded from impedance
changes in the 3.5mm jack connector, does it belong in alsa somewhere?
Bose QC25 buttons works on Intel HDA cards on new Dell XPS laptops, so
I'm guessing it should be possible within snd-hda-intel...
- Mads
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