Ubuntu
alsa-driver package

  1. Bug #778045
  2. Comment #4

Comment 4 for bug 778045

Revision history for this message
madbiologist (me-again) wrote :

For Ubuntu 13.10 "Saucy Salamander" and earlier, HDMI audio on ATI/AMD Radeon cards is disabled by default by the upstream kernel developers as it causes blank screens on a lot of systems.

You can re-enable HDMI audio by adding "radeon.audio=1" to your GRUB boot options as described at https://help.ubuntu.com/community/Grub2/Troubleshooting#Editing_the_GRUB_2_Menu_During_Boot

Beginning with the upstream 3.13 kernel, the radeon.audio=1 kernel boot option will no longer be necessary. Instead, HDMI audio on ATI/AMD Radeon cards can be enabled and disabled on the fly by typing the following in a terminal window:

xrandr --output HDMI-0 --set audio on

or

xrandr --output HDMI-0 --set audio off

If your HDMI port is numbered differently (type "xrandr" to check) - you might need to change HDMI-0 in the above command to HDMI-1 or HDMI-2.

Ubuntu 14.04 "Trusty Tahr" is based on the 3.13 kernel.