[alsa-devel] Shared volume control again

[David Henningsson]

On 2014-10-29 18:02, Takashi Iwai wrote:
> Hi,
>
> thinking of the problem about shared volume controls again, I stumbled
> on a case where your suggested solution doesn't work well.  Namely,
> when a headphone volume is shared for two headphones (one on the
> laptop and one on the dock), how should it be named?  One is
> "Headphone" and another is "Dock Headphone".  That's a bit tricky.
>
> So, in the end, we need the mapping representation somehow more
> explicitly than the control name.
>
> Thoughts?

In practice, it seems like we more often than not share DAC for all 
headphones. Also it is very common today that a jack called "Front 
Headphone" has a volume control called only "Headphone".

That's the status quo. As a result we have only one headphone path in 
PulseAudio for all types of headphones.
And it kind of works as long as we *always* share DAC between the 
different headphones. And when we don't, they're usually both controlled 
by a vmaster anyway. I haven't seen anything else recently, are you 
planning to make "headphone" and "dock headphone" have separate volume 
controls?

-- 
David Henningsson, Canonical Ltd.
https://launchpad.net/~diwic