HDMI cable - no sound

If your HDMI device isn't receiving audio from your Mac:

• Choose Apple menu > System Preferences, then click Sound. In the Output pane, make sure that your HDMI device is selected.
• If you're connecting using a Mini DisplayPort adapter, make sure that your Mac can send audio over Mini DisplayPort.
• If you're connecting from a Mac mini, unplug any audio device that is plugged into your computer's Audio-Out port.

If your Mac goes to sleep while a video is playing or paused, you might see an HDCP error. Quit the app that is playing the video, then open the app again. If the issue continues, choose Apple menu > System Preferences, then click Energy Saver and adjust the settings so that your display doesn't turn off.

Same situation here. MacPro 5,1 (flashed from 4,1) Runs perfectly but HDMI audio is no longer available, This is with a GTX680 card that worked smoothly with no special treatment in High Sierra.

Super annoying, especially since I have been reporting this to Apple for 6 months while the product was still in Beta and until today.

Apparently there really don't care. It's very interesting that in the bug reporting app for beta MacOS there isn't even a category for Audio or Sound problems!

Reporting in that I'm having the same problem on BOTH of my Macbooks - a 2012 Macbook Pro that I'm using a miniDP adapter for and a 2015 Macbook Pro that uses HDMI direct out. No video problems, I've tested the cables with other devices and they are working, HDMI does NOT APPEAR as an output option at all. Previously they worked without any problems.

I use HDMI out from my 2014 MBP and it works with sound and image in Mojave. Not sure why it fails for some users. Maybe resetting NVRAM could help.

Also you could run Etrecheck and post its report here. There may be a conflict with some other software.

Can you elaborate on why this may be needed?

If I understand correctly, the proposed fix involves installing a kernel extension.

Since I do not have that extension and have no trouble with HDMI audio, I have to wonder if there is something else involved.

Googling it I found some references to this, but they seemed to all involve hackintoshes or at least people with pre-2013 mac pro that had replaced their graphics cards.

I wonder if this proposed fix may not help in other cases.

There are no HDMI device in the list. It was there before the upgrade to Mojave, in High Sierra.

I'm having the same situation. It was there before the upgrade for me as well. Now it's gone and I have to use bluetooth.

The same. So annoying.

I got same problem no sound (Mac Pro 4.1 to 5.1 ) I am using DVI to hdmi, and I don’t get any device in output ,

i got 2 different graphics card my Tv is not even 4K

I have the same exact problem it was working before upgrading to Mojave, I have the Macbook Pro

https://www.dropbox.com/sh/kv3aghwsym6nvgk/AADRWXfEBdGkj3YsfwTTVM92a?dl=0

Click the above link, press the download button top right.

Follow the instructions, and you should get Audio from HDMI.

Well its an alternative that I use, it has uninstall instructions too, if needed.