With a kernel before 3.13 (first included in Ubuntu trusty) the HDMI output is not enabled by default in the open source driver. Please, check that you're using the kernel parameter radeon.audio=1 during boot, or add it to your grub configuration.
** Changed in: xserver-xorg-video-ati (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xserver-xorg-video-ati in Ubuntu. https://bugs.launchpad.net/bugs/1268229 Title: not HDMI output option (audio) xserver-xorg-video-ati (1:7.2.0-0ubuntu10) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/1268229/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp