Sound Not playing through HDMI

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http://askubuntu.com – I am running Ubuntu 12.10 using the "wubi" tool on my HP Pavilion dv5-1080ei with Windows 8. When I ran Ubuntu for the first time my monitor/tv connected via the hdmi had no pic coming to it even though it was showing up in the display settings. I managed to fix this problem by changing the NVIDIA driver from the default "Nouveau" to one of the proprietary ones.This made the picture work on my monitor/tv but not the sound :( I tried all the different proprietary drivers on the list, all the same. When I go to "test sound" the audio ONLY plays through my laptop speakers even if I have the HDMI (HowTos)