On 11/24/2017 04:02 PM, Wolfgang Pfeiffer wrote:
Doug, Philip, and Everyone
I started a new thread with the quotes below to make
sure to not hijack the thread where they were taken from ...
Short version:
The whole thing isn't that important - if in doubt, ignore it ... :)
The main reason I wrote this email is plain and simple
curiosity about whether it can be done, and how: namely to feed sound
on a Linux machine to two audio systems at the same time: to
internal speakers on the computer and to external ones like, e.g.,
those in a TV, via HDMI. And all this on Fedora 26 system
On Thu, 23 Nov 2017 21:49:17 -0500
Doug <dmcgarrett@xxxxxxxxxxxxx> wrote:
[ ... ]
Perhaps I should elaborate: On my system, I have a MB with a sound
output. I also have an NVidia video card that also contains a sound
decoder with an HDMI output jack. With this combination, AND
PulseAudio, I can get simultaneous sound (near the computer with
the MOBO sound output) and video on both the local monitor and the
TV from the NVidio card, AND sound on the TV from the NVidia card
also, via the hdmi connection. It may take some serious fiddling
around with the possibilities in PA, but it CAN be done.
To get sound simultaneously from your internal computer speakers and TV
(connected via HDMI): which tool(s) did you use? pavucontrol? paman?
paprefs?
Settings in ~/.asoundrc ?
As I said, there is sound on the mother board. That comes out of the
mobo on a "headphone" jack and goes to a Logitech system that has a box
with an 8" speaker (for bass) and two
small speakers for the rest, and an audio amplifier that is in the big
speaker box. The HDMI output comes out of the NVidia card on a miniature
hdmi connector (You need an adapter, or a
special cable) and goes to the TV carrying video and audio, IF YOU HAVE
PA CONFIGURED RIGHT. It will always give video, but audio depends on how
well you finagle PA's many possible
configurations, which is the harrowing experience. It will help if you
can hear the TV sound while you're messing with this. (Turn down the
local sound and listen for the TV sound. Run something
like YOuTube with a long output, like a DVD repro, or something.)
--doug
Looks like I have two sound systems on my machine - if true it might be
possible to run them concurrently:
_______________________________
lspci -nnk |grep -A 7 -i vga
00:02.0 VGA compatible controller [0300]: Intel Corporation 4th Gen Core Processor Integrated Graphics Controller [8086:0416] (rev 06)
Subsystem: Dell Device [1028:05aa]
Kernel driver in use: i915
Kernel modules: i915
00:03.0 Audio device [0403]: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor HD Audio Controller [8086:0c0c] (rev 06)
Subsystem: Dell Device [1028:05aa]
Kernel driver in use: snd_hda_intel
Kernel modules: snd_hda_intel
--
01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Neptune XT [Radeon HD 8970M] [1002:6801]
Subsystem: Dell Device [1028:05aa]
Kernel driver in use: radeon
Kernel modules: radeon
01:00.1 Audio device [0403]: Advanced Micro Devices, Inc. [AMD/ATI] Cape Verde/Pitcairn HDMI Audio [Radeon HD 7700/7800 Series] [1002:aab0]
Subsystem: Dell Device [1028:05aa]
Kernel driver in use: snd_hda_intel
Kernel modules: snd_hda_intel
_________________________
Specs regarding the lspci result from above:
Please note that on this machine there's one mini display port and one HDMI port:
AMD specs for the Radeon card say the DisplayPort 1.2 (mini
display port is broken on current Fedora¹ since quite some time) is
"Multi-Stream", while the specs on HDMI (works here) say nothing about
"Multi-Stream"
http://www.amd.com/en-us/products/graphics/desktop/oem/8900#
That's what Intel says about E3-1200 v4
on
https://www.intel.com/content/www/us/en/processors/xeon/xeon-e3-1200v4-vol-1-datasheet.html?wapkw=e3-1200+v4
--------------------------------
"The processor also integrates dedicated a Mini HD audio controller to drive audio on
integrated digital display interfaces, such as HDMI* and DisplayPort*. The HD audio
controller on the PCH would continue to support down CODECs, and so on. The
processor Mini HD audio controller supports two High-Definition Audio streams
simultaneously on any of the three digital ports."
------------------------------
The last sentence:
"The processor Mini HD audio controller supports two High-Definition
Audio streams simultaneously on any of the three digital ports."
Philip:
After I wrote, that I cannot use both speaker systems (internals
speakers from the computer and external ones from e.g. TV) at
the same time you mentioned ~/.asoundrc:
"That should be fixable with a properly configured .asoundrc file? -
might need an ALSA guru to do it though . ."
Might be difficult to find ALSA gurus ... :) - but I played
with .asoundrc years ago on a Macintosh powerp machine, with Debian on
it - with surprising results (and I'm far from being an audio
guru):
https://lists.debian.org/debian-powerpc/2009/08/msg00049.html
So thanks for pointing to .asoundrc: it hinted to me that ALSA is
still there - didn't realize that - I simply thought it was gone with
pulseaudio. And yes: I had not much of an idea of what PA actually is
until yesterday - I just knew that audio worked here ...
Sound setup tho' *might* become more complicated now with both
pulseaudio plus alsa being involved - not sure about it yet ..
Thanks again ..
Wolfgang
¹ https://bugzilla.redhat.com/show_bug.cgi?id=1470845
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