Sony VGN-A140P Manual

Fn+F5 

Decreases the LCD screen brightness. 

Fn+F6 

Increases the LCD screen brightness. 

Fn+F7  Toggles the display between the computer screen (LCD), a connected external display, and both the LCD and an
external display. Select one display when playing a DVD. 

Fn+F12 

Puts the system into Hibernate mode, a power management state. To return the system to normal operating

mode, press the power button. Hibernate mode consumes the lowest level of power. 
Fn+Esc 

Puts the system into Standby mode, a power management state. To return the system to the active state,

press any key or the power button.