I just installed a fresh Ubuntu 12.10 64-Bit Desktop on my Lenovo W520. It looks like there are a lot of challenges around making it work with out of the box Nouveau drivers or propriety Nvidia drivers or Intel GPU. I looked at couple of notes on how to make it work with Bumblebee with Optimus Nvidia. None of them seems to work for 12.10. Anybody has a solid answer on this? It seems like a lot of people are suffering from this.

Here is my xrandr output. Let me know if you need any additional information.

Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192
LVDS1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 344mm x    193mm
1920x1080      60.0*+   59.9     50.0  
1680x1050      60.0     59.9  
1600x1024      60.2  
1400x1050      60.0  
1280x1024      60.0  
1440x900       59.9  
1280x960       60.0  
1360x768       59.8     60.0  
1152x864       60.0  
1024x768       60.0  
800x600        60.3     56.2  
640x480        59.9  
VGA1 disconnected (normal left inverted right x axis y axis)

Thanks, Sef