This feature has been removed in Ubuntu 12.04. Here is the explanation why:
http://web.archive.org/web/20121014092420/http://voices.canonical.com/david.henningsson/2012/04/14 /audio-over-hdmi-and-displayport-in-ubuntu-12-04/ -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to pulseaudio in Ubuntu. https://bugs.launchpad.net/bugs/809678 Title: Pulse should output sound automatically when HDMI cable is plugged Status in “pulseaudio” package in Ubuntu: Fix Released Bug description: In Win7 when I connect an HDMI cable it outputs sound through it automatically if the device has speakers, like an HDTV. In Ubuntu I have to set the sound over and over again when plugging and unplugging my laptop. This is a small but very irritating limitation. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/809678/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
