@Chris - Right click on the volume icon on your gnome panel and open the
volume control dialog. Make sure the device is selected as NVIDIA HDA
something (sorry I'm writing this from memory at work). Then click the
Preferences button and enable the checkbox labelled 'Source' or 'Channel
Options' or 'Channel Source' (sorry again I can't really remember what
the option is called). This should then provide an option back in the
volume control dialog to select either 2 or 6 channel. Also make sure
you enable 'Line Out' and set the line out volume (since this controls
the volume of the speakers). You should then get sound out of atleast
the right speaker - the left one doesn't appear to work - see bug
https://bugs.edge.launchpad.net/ubuntu/+source/alsa-driver/+bug/337314

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[Jaunty] No sound output with MacBook 5.1
https://bugs.launchpad.net/bugs/337947
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