Re: Jack & pulse...knickers in a twist.

[Mac <macdroid53@xxxxxxxxx>]

On Wed, Jun 6, 2018 at 10:22 AM, Bill Purvis <bill@xxxxxxxxx> wrote:

On 06/06/18 14:12, Mac wrote:

....

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".

I use qjackctl, so I'm not that familiar with the command line interface.
In the Qjackctl settings panel, under advanced, it shows the 'system' output device,
and also a field for number of channels. I had an 8-channel DAC connected a while back
and setting channels=8 and restarting produced 8 system outputs. So it is possible.

Looking at web pages for jack_control, I'd suggest trying:

    jack_control dps device surround71LPCH,0
    jack_control dps channels 7

might be the answer?

Assuming the 'L" was a typo i changed the lines in the script to:

jack_control dps device surround71:PCH,0
jack_control dps channels 7

That produced the following error after attempting execute the second line:

DBus exception: org.jackaudio.Error.InvalidArgs: Invalid container address 'driver':'channels':'(null)' supplied to method 'GetParameterInfo'.

A look at the jack_control help showed the parameter was "outchannels: Number of playback channels (defaults to hardware max) (uint:notset:0:0)"

I assume this means the surround71 knows only 2 channels, but I changed the script:

jack_control dps device surround71:PCH,0
jack_control dps outchannels 7

This does not throw an error, but still only results in 2 system outputs.

_______________________________________________
Linux-audio-user mailing list
Linux-audio-user@xxxxxxxxxxxxxxxxxxxx
https://lists.linuxaudio.org/listinfo/linux-audio-user