I'm running Ubuntu 18.04 on a Gigabyte 78LMT-USB3 (gen 6) motherboard. Using HDMI audio via my graphics card is not working at all. Sound via headphones is working fine.

Here is my alsa report: http://www.alsa-project.org/db/?f=317bebb3e63a8726494c1637432903834c7c128c

Any ideas why I can't get any audio via my graphics card?

  • Something like a nVidia GTX 970M to a GTX 1060? – WinEunuuchs2Unix May 6 '18 at 18:04
  • No its an AMD Radeon HD 7870 graphics card. I'm plugged into the HDMI port on it. Got display all fine just no audio, audio works via headphones though – Jamesking56 May 6 '18 at 18:47
  • Good to know as I have nVidia which has different solutions. – WinEunuuchs2Unix May 6 '18 at 18:59

You may need to add kernel parameters to /etc/default/grub.

sudo nano /etc/default/grub

Look for GRUB_CMDLINE_LINUX_DEFAULT and add amdgpu.dc=1 (or, if it doesn't work, radeon.audio=1). Then update grub and reboot:

sudo update-grub

Then look at the last tab in pavucontrol for a profile that includes HDMI output.

  • It says that they are all unplugged – Jamesking56 May 6 '18 at 17:41
  • I assume you've checked cables and made sure all devices are turned on? ... try running pulseaudio -k ; sleep 1 ; if ! pgrep pulseaudio ; then pulseaudio -D ; fi ... then try pavucontrol again? – xiota May 6 '18 at 17:58
  • Cables are fine, your command showed a couple of numbers but pavucontrol still shows all HDMI stereo unplugged – Jamesking56 May 6 '18 at 18:42
  • didn't use Ubuntu, 18.04 is first version – Jamesking56 May 6 '18 at 21:02
  • What happens if you select HDMI anyway, even though it says unplugged? – xiota May 6 '18 at 21:08

My HDMI Audio (AMD HD 4850) has disappeared after installing new kernel on Ubuntu 18.10. Restart system with previous kernel version helped to solve the issue:

  • kernel 4.18.0-21-generic: HDMI Audio is not working
  • kernel 4.18.0-20-generic: HDMI Audio is working

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