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

[David W. Jones]

On June 5, 2018 9:20:25 AM HST, 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.
> 
> 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".

My guess is if you pick the surround sound device as JACK's output device, you'll get the 7.1 outputs. But this is also well beyond my knowledge!

--
David W. Jones
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authenticity, honesty, community
http://dancingtreefrog.com

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