My HDMI card isn’t passing audio to my Samsung HDTV.
This problem is evidently above my pay grade.

This is my First install of Ubuntu’s very latest Jammy Jellyfish
DL done today & etched to stick w/ Rufus

I had to clear one error with the ACPI power management, and after I changed the bios there were no more messages. Now the system boots normally & runs like a rocket.

Basic details:
Fresh 1TB Samsung SSD
MSI 790FX-GD70 mobo
AMD Phenom2 x4 955 @3.2Ghz
12 gigs corsair ram
Sapphire radeon HD4850 with DVI VGA HDMI out

Amplified speakers run ok from 1/8” mobo plug
Swapping output in settings to hdmi shows run time advancing,
but No sound output from hdmi port.

The cable and TV work fine from my AV receiver.

I am a retired PC bum, long time CAD geek & windows registry hacker, who built his first analog computer kit in 1968. Dad programed the IBM 360 way back in the Doctor Strangelove days. But I haven’t built a Linux machine since Mandrake 2.1 back in the mid 90s.

So far this is more painless, trouble free, and faster than any MS windows installation I can remember. And I’ve been doing them since version three. Considering the good luck I’ve had so far, in that everything else seems to be working perfectly, I am so glad I picked Ubuntu.
EDIT....BTW I ran alsamixer & s/pdif-D is on, but i can't turn on s/pdif. Is this either/or? Should both be possible?

Things that I would check.....

First, check the TV handset volume.

Then, check pavucontrol, to see if it has control of your soundcard.

Otherwise, this may help - https://bbs.archlinux.org/viewtopic.php?id=263139

1 members found this post helpful.

Thank you Mac. I am definitely making progress thanks to you, and have produced HDMI audio through the television speakers. With the help of Pavucontrol I was able to get the HDMI sound to work.

Unfortunately whenever there is a change of sound stream, the old sound process retains control of the audio.
I have to run Pavucontrol again and set control of the video card to the new process or stream as it were.

When it is working, sound control reports nothing in the device field. Literally, nothing, as the field is blank where it should list the Radeon card.
Yet the audio works.
Until, one stream ends and the next starts.
If I start YouTube it will play an advertisement, and then when the ad ends, there’s no sound. I have to go back in and enable it for that stream to have audio.

It’s like somebody hit the mute button but when I checked the device is changed back to external speakers (which I remove, once I heard HDMI sound through the TV speakers.)
I don’t truly know what’s going on with the volume control program though. I may have created some strange loop back situation so I need to find a good set up guide for that. I don’t know much about how sound cards interact with the system.

This link has a few options to look at to see if any apply to you.
https://askubuntu.com/questions/1406...ng-dummy-audio
or this link https://askubuntu.com/questions/1403...e-ubuntu-22-04
From this link: https://help.ubuntu.com/community/So...otingProcedure
I found this recommendation in section7

1 members found this post helpful.

Everything works OK now, after I figured this out. I made several changes to the hardware, and it was plug & play all the way.

Because of ubuntu I am using $$$ gear again, that I had sadly mothballed. because of Win 7 etc creeping issues.

Thanks to @fatmac & @uteck for all the help.

It seems that I spoke too soon. I keep having the same problem where every audio event requires me to deselect and re-select the radion card in output.

If I mute the volume or play an advertisement or select a different video, I will loose audio every time.

But if I de-select and re-select the card, it comes back immediately.

Maybe I just need to create a little widget that does this for me. Or maybe there’s a better driver somewhere. Anyhow I’m not giving up yet. The performance of the system is so much better than my Sony streaming video player that there’s no comparison, plus of course having a computer online allows me to do much more.

And that streaming video player was far from flawless itself. Good riddance!

Looks like this problem has been around for awhile. https://gitlab.freedesktop.org/drm/amd/-/issues/1569
What driver are you using for the video card? AMDGPU is the latest opensource driver but drops support for older cards, https://wiki.archlinux.org/title/AMDGPU
For older cards use the Radeon driver.
Maybe try the official driver from AMD and see if the problem persists; https://www.amd.com/en/support/linux-drivers

1 members found this post helpful.

Thank you.

Maybe I will try a newer GeForce video card first. I was looking for an excuse, as it’s a much more expensive card.
I can’t just have it laying around unloved.

I did all the available updates today, and it all works, when switching applications. But on boot I always have to turn on the card in volume control. I haven’t figured how to set that to run automatically.

Not sure if this will fix it, but worth trying.....

https://unix.stackexchange.com/quest...in-pulse-audio

1 members found this post helpful.

Thanks again @fatmac.

I didn't have the profile locked.

D'oh!

It all seems to work properly now.

But I'll need another excuse to use that $$$ video card.