1 On many Sony laptops, you can raise the screen brightness by pressing the Function and F5 keys simultaneously. 2  To lower the brightness, press the Function and F6 keys simultaneously. 3  The VAIO Event Service must be running on your laptop for this method to work.nstructions. Navigate to the Start menu. Type Power Options in the Search programs and files field at the bottom of the Start menu. Press Enter.. The Power Options window will appear. Move the slider bar that appears beside Screen brightness until you achieve your desired level of brightness.