Cannot set monitor to native resolution
Please upgrade to the latest kernel 3.5. You will get the native fixed 1080p resolution
You can get the latest kernel from the Ubuntu 12.10 repository
You cal also try the modesetting driver. You will gain a range of several resolutions. But, if you want to gain a video acceleration I suggest you to use the latest EMGD drivers. It will be a little dirty work, but it worth it.