[alsa-devel] Shared volume control again

[Hui Wang]

On 10/30/2014 09:18 AM, Raymond Yau wrote:
>>> 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.
>
> it is unlikely that dual headphone jacks share DAC on those Dell XPS
> notebook with 8 channels hda codec
>
> Surround 40 should not be supported when headphone and dock headphone
> always share DAC
>
> Are there any difference when dock station has dock line out instead of
> dock headphone?
>
> Another ad hoc case is asus g75 with vt1802 which have speaker and
> subwoober,  headohone and speaker share DAC so that the subwoofer can have
> volume control
Hi Raymond,


It seems like you are familiar with hardware configuration for different 
machines, BTW do you know any Lenovo/Dell/HP laptops which have 
subwoofer on them?


Thanks,
Hui.

> For Dell alienware notebook with alc668,  headset and headphone jack, mic
> jack internal 2.1 speaker
>
> User expect the headset jack default to be used as headset since the
> notebook has another headphone jack
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