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Dual output from HDMI possible?
iwantlinuxgames commented on 17 April 2019 at 12:46 am UTC

so, I've been trying to find an answer to this for quite some time....here's my quandry:

I've an Nvidia RTX 2060(but i've been trying since my GTX 950..probably a couple years now...) with 2x 40in LED widesreen TVs attached with audio via HDMI output...i can use one TV or the other as the audio output(ergo HDMI1). I also have HDMI2 and HDMI3 available as ouput via HDMI and DisplayPort, respectively.

I have been unable to find a way to utilize HDMI1 and HDMI2 as simultaneous audio output. All I seem to be able to find is how to use simultaneous audio devices, instead of simultaneous output channels.

anyone know if simultaneous output channels are possible?

Guppy commented on 17 April 2019 at 5:24 am UTC

I'd think that would happen by default if the audio signal was wired in HDMI2 - if you only connect HDMI2 do you get audio on it?

if you do you should be able to make it happen.

I'm not sure what audio subsystem KDE uses - if it's pulse audio then it's relatively simple;
https://www.maketecheasier.com/play-sound-through-multiple-devices-linux/

if it's ALSA then your going to have to mess around with JACK routing http://www.jackaudio.org/, which while super powerfull is a little tough to set up ( or atleast it was when I last used it, which granted is quite a few years ago )

Ehvis 3 years commented on 17 April 2019 at 7:52 am UTC

iwantlinuxgamesAll I seem to be able to find is how to use simultaneous audio devices, instead of simultaneous output channels.

What do you mean by "simultaneous channels" instead of "simultaneous devices"?

iwantlinuxgames commented on 17 April 2019 at 11:48 am UTC

Ehvis
iwantlinuxgamesAll I seem to be able to find is how to use simultaneous audio devices, instead of simultaneous output channels.

What do you mean by "simultaneous channels" instead of "simultaneous devices"?

simultaneous devices consists of HDMI + an Audio Processor such as an onboard DSP(Intel HD Audio, Realtek ALC chipsets, etc).

by simultaneous channels, I mean HDMI1 + HDMI2..

I can choose TV1's audio as an output channel, or i can choose TV2's audio as an ouput channel, but am unable to find a way to pipe audio to both TV1 and TV2 at the same time via the Nvidia card's HDMI audio processor.

Ehvis 3 years commented on 17 April 2019 at 1:42 pm UTC

Ah, so the HDMI connectors are separated like the line out / headphones for the regular outputs. Seeing as there are people having issues with both line out and headphones receiving sound, it's probably possible to make it happen for hdmi as well. Not part of the pulseaudio configuration I've had to go into yet though. I'll have a quick peak when I get home.

iwantlinuxgames commented on 18 April 2019 at 5:36 am UTC

GuppyI'd think that would happen by default if the audio signal was wired in HDMI2 - if you only connect HDMI2 do you get audio on it?

if you do you should be able to make it happen.

I'm not sure what audio subsystem KDE uses - if it's pulse audio then it's relatively simple;
https://www.maketecheasier.com/play-sound-through-multiple-devices-linux/

if it's ALSA then your going to have to mess around with JACK routing http://www.jackaudio.org/, which while super powerfull is a little tough to set up ( or atleast it was when I last used it, which granted is quite a few years ago )

missed your reply yesterday evening...anyway...

kubuntu uses pulseaudio....the link you have provided for paprefs has already been tried by yours truly...it is for "simultaneous devices"....i'm only wanting to use a single device(Nvidia hdmi audio processor) but output to multiple channels, ergo HDMI1+HDMI2.

yes the second TV outputs audio if i select that as an output channel....what i am trying to achieve is audio through BOTH TVs simultaneously...as it stands i can only choose TV1 OR TV2(HDMI1 or HDMI2), not both channels combined.....

as ehvis stated above, it's a bit like having a single audio device with a line out and a headphones output on the single device and routing audio through both the line out channel and the headphones channel at the same time(in case you wanted to add a second set of speakers via headphones channel).

as far as jack goes, it really hasn't changed much probably since you tried it some few years ago.....it's still a rather complicated piece of software to fiddle with unless you're a sound engineer, which i am not.

just thought maybe someone hear might have tried something similar in the past and could provide me some insight into how i might go about achieving what i hope to be able to do....

PS: the TVs are attached to a single Nvidia 2060 in a dual-head configuration....websurfing and video games on the left primary display....movie/TV show streaming on the right secondary display...

Ehvis 3 years commented on 18 April 2019 at 3:05 pm UTC

I had a look, and the HDMI ports are not actually assigned as ports, but as profiles.

I haven't checked it in depth, but it looks like this page could have a solution to your problem. It is a bit of manual fiddling though. It's the second half of the page, the first half if for separated cards.

iwantlinuxgames commented on 18 April 2019 at 6:50 pm UTC

EhvisI had a look, and the HDMI ports are not actually assigned as ports, but as profiles.

I haven't checked it in depth, but it looks like this page could have a solution to your problem. It is a bit of manual fiddling though. It's the second half of the page, the first half if for separated cards.

that's looks to be what i need to try . thanx for that . no time to fiddle with it til later, as i have to get ready for work in a bit.....if i'm not too tired this evning after work i might give it a go...otherwise, as soon as i have time to mess with it, i'll report back if it was a success or not.

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