Shared volume control again

Shared volume control again

[Takashi Iwai]

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?


Takashi

Re: 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

Re: Shared volume control again

[Takashi Iwai]

At Wed, 29 Oct 2014 18:12:14 +0100,
David Henningsson wrote:
> 
> 
> 
> 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.

OK, so "Headphone" volume should be handled by both "Headphone Jack"
and "Dock Headphone Jack" detections?  Then it's fine.  I thought this
wasn't the case (from my memory dealing with an old bug report).

> 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?

No, splitting is impossible with vmaster.


thanks,

Takashi

Re: Shared volume control again

[David Henningsson]

On 2014-10-29 18:17, Takashi Iwai wrote:
> At Wed, 29 Oct 2014 18:12:14 +0100,
> David Henningsson wrote:
>>
>>
>>
>> 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.
>
> OK, so "Headphone" volume should be handled by both "Headphone Jack"
> and "Dock Headphone Jack" detections?  Then it's fine.  I thought this
> wasn't the case (from my memory dealing with an old bug report).

Yes. The "Dock Headphone Jack" name was added quite recently though, so 
it's only in git master right now.

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

Re: Shared volume control again

[Raymond Yau]

>>
>> 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

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

Re: 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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> Alsa-devel mailing list
> Alsa-devel@alsa-project.org
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>

Re: Shared volume control again

[Raymond Yau]

BTW do you know any Lenovo/Dell/HP laptops which have subwoofer on them?
>

https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/log/sound/pci/hda?qt=grep&q=subwoofer

https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1302090

Those dell alienware 14,17 and 18

Re: Shared volume control again

[Hui Wang]

On 10/30/2014 11:33 AM, Raymond Yau wrote:
>
>
> BTW do you know any Lenovo/Dell/HP laptops which have subwoofer on them?
> >
>
> https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/log/sound/pci/hda?qt=grep&q=subwoofer
>
> https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1302090
>
> Those dell alienware 14,17 and 18
>
Got it, thanks.