On Wed, 6 Jun 2018, Mac wrote:
On Tue, Jun 5, 2018 at 3:20 PM, Len Ovens <len@xxxxxxxxxxxxx> wrote:
On Tue, 5 Jun 2018, Mac wrote:
surround71:CARD=PCH,DEV=0
HDA Intel PCH, ALC892 Analog
7.1 Surround output to Front, Center, Side, Rear and
Woofer speakers
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
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".
Is jack running? is anything making noise through pulse? Can pulse do 7.1?
If anything is actively using PCH,0 then hdajackretask (or any other
utility) would not be able to change things. You may need to set the
device profile in pavucontrol to "Off" as well as making sure jack is
stopped before hdajackretask will be able to do things. I was able to
reset a jack in my case, but then I am not using the device for jack or
pulse. When I busied the device up with zita-j2a I was still able to
change one of the pin uses.... but, my zita-j2a process then started 100%
cpu :) This may have something to do with changing the current input port
into an output port :P (It took a kill -9 to stop that zita-j2a)
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.)
I can understand that. The most surefire way I can think of is to wade
through the pulseaudio code (assuming pulse can be set to surround7.1).
Also, assuming a laptop, while the audio setup inside may have 8 outputs,
there may be fewer physical jacks to use anyway. My laptop has only two
jacks for example for a maximum of 4 channels, some have three, but I have
not seen any more than that. I think HDMI can go to 5.1 as well (but
needs an non-free encoder... that could be old info, newer hdmi may do 6
or 8 channels natively).
Of course in the end Jack may just lack the code to set the device for
other channel counts. I don't know alsa coding well enough to know.
--
Len Ovens
www.ovenwerks.net
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