[ubuntu] hdmi link up to monitor - no sound

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http://ubuntuforums.org – Hey guys. I just tried liking up my Aspire One Netbook which is running Gnome fallback (Ubuntu 12.04) to a View Sonic television, which can also be used as a monitor. At first I thought HDMI might not support sound, but of course it does as it's the only cable I use to connect to my xbox. Anyway, I manage to get the screen output on the television but there is no sound. I tried plugging the (red/white) audio cables into my laptop but that does nothing either. Is there any previous configuration that has to be done to enable sound for the HDMI cable in Linux? Any help is hugely apprecia (Hardware)