Sony VGN-A600P 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. Connect the cable(s) before you turn on the computer; otherwise, Fn+F7 will not
work. 
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.