Have you tried booting with radeon.audio=1 option?
Basically, edit the /etc/default/grub file, find the GRUB_CMDLINE_LINUX_DEFAULT
line, and add radeon.audio=1 so it looks like:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash radeon.audio=1"
Save the file, quit the text editor, and then run the following command:
sudo update-grub
Reboot, and see if there's audio.
** Changed in: linux (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/1072598
Title:
[Dell Inspiron M4110] HDMI audio doesn't work
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