[ubuntu] MacBook 1,1 and 12.04: help with display resolution

Hello,

I have an old MacBook I am hoping to use as an entertainment system. When I hook it up to my LCD TV I am stuck in either 1024x768 or 800x600. This does not happen when I am booted into Mac OSX, so it is not a hardware limitation. Is there a way to get this working properly? The video card is an Intel 945 GM.

Thanks!
Matt