6 Jun
2018
6 Jun
'18
9:32 p.m.
Just caught an interesting thing.
With the script as shown below, I get solid, reproducible setup every time:
#!/bin/bash
killall -9 jackd jackdbus
jack_control ds alsa dps capture none dps playback none
jack_control dps device hw:PCH
jack_control dps rate 48000
jack_control dps nperiods 2
jack_control dps period 256
jack_control start
pactl unload-module module-udev-detect
pactl unload-module module-alsa-card
pactl unload-module module-jackdbus-detect
pactl load-module module-jack-sink client_name=PulseOut channels=2
connect=no
pactl load-module module-jack-source client_name=PulseIn channels=2
connect=no
jack_connect system:capture_1 PulseIn:front-left
jack_connect system:capture_2 PulseIn:front-right
jack_connect PulseOut:front-left system:playback_1
jack_connect PulseOut:front-right system:playback_2
But, the sound is specifically connected to the onboard speakers of the
laptop. If I plug headphones in, the speakers stop and nothing from the
headphones.
I suppose this is expected, since pavucontrol shows only the Jack sink
(PulseOut).
On Wed, Jun 6, 2018 at 12:38 PM, Mac <macdroid53(a)gmail.com> wrote:
On Wed, Jun 6, 2018 at 10:22 AM, Bill Purvis <bill(a)billp.org> 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".
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.
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?