Comment 114 for bug 1169984

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madbiologist (me-again) wrote :

Alessandro - HDMI audio on ATI Radeon hardware was disabled 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 - see https://help.ubuntu.com/community/Grub2/Troubleshooting#Editing_the_GRUB_2_Menu_During_Boot. This issue is being tracked in bug #897008.