[ubuntu] No sound from TV speakers

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http://ubuntuforums.org – I have recently installed Ubuntu 9.10 onto a Sony Vaio VGN-SR41M laptop and have had no problems until I tried to connect it to a TV. I used a HDMI cable and the picture worked fine however no sound was coming from the speakers on the TV. I tried to change the output to the HDMI output in the sound settings but still couldn't get it to work. Any help will be greatly appreciated. Many thanks. (Hardware)