[LAU] Jack & pulse...knickers in a twist.

[Mac]

On Tue, Jun 5, 2018 at 3:20 PM, Len Ovens <len at ovenwerks.net> wrote:

> On Tue, 5 Jun 2018, Mac wrote:
>
> The piece I don't see is, assuming there is a device with 5 outputs, how
>> do you
>> get jack to create playback_3, _4 etc.
>>
>> (I get aplay doesn't show jack, but, for example aplay -L lists (this is a
>> shortened list):
>>
>> front:CARD=PCH,DEV=0
>>     HDA Intel PCH, ALC892 Analog
>>     Front speakers
>> surround71:CARD=PCH,DEV=0
>>     HDA Intel PCH, ALC892 Analog
>>     7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
>> hw:CARD=PCH,DEV=0
>>     HDA Intel PCH, ALC892 Analog
>>     Direct hardware device without any conversions
>> hw:CARD=PCH,DEV=1
>>     HDA Intel PCH, ALC892 Digital
>>     Direct hardware device without any conversions
>>
>> How does jack decide to only do 2 playback_1,_2?
>>
>> I take it there is something else in alsa startup that says provide for
>> example
>> surround71
>>
>
> I do not know if jack will accept surround71:PCH,0 for device. I do not
> know the mechanism by which it switches either. You are getting beyond my
> knowledge. It would not hurt to try. The other thing to look at may be
> hdajackretask. This shows what the audio jacks are currently being used
> for. I do not know if changing "blue Line In" to "Rear Side" will change
> hw:HDA from 2.0 to 4.0 for example. but it may be worth a try. Setting
> physical jacks to do surround operation may be all it takes.
>
>
Apparently not. I tried "jack_control dps device surround71:PCH,0" and
still got playback_1,_2. (There are also surround21, 41, etc. none of those
changed anything either.)
As for hdajackretask, when I tried to "Apply now" I got a device busy
message. I didn't try "Install boot override".


> In my case the real answer is I don't know. I tend to disable any internal
> audio device to clear up one more thing that may interfere with "real
> audio".
>
>
Agreed, when in my studio or at a venue where I have "real audio". But,
sitting in my hotel room or elsewhere, with only my laptop and it's
internal hardware...one must improvise. ;)

(Not saying I would need more than 2 outputs in such a case, that's just a
"hey, the thing has more than two channels, how do get to them" musing.)
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