I have the IdeaPad Y570 and whenever I play Call of Duty or watch a DVD video the game or video does not display the full screen size. Instead, the image/s displayed are about a third the size of the laptops widescreen. I contacted Lenovo and they informed me that I needed to update the video driver (I've only had the computer since September of '11). Tried updating the driver, but this did not resolve the issue..
Some games allow a resolution setting which may differ from that of the desktop. Check the game settings for this option to ensure that the resolution of the game is set to the same resolution as your desktop.