Sony PCG-GRT290ZP Manual

Fn+F3 

Toggles the built-in speakers off and on. 

Fn+F4  Adjusts the built-in speaker volume. An on-screen display appears notifying you when a change occurs. 

To increase volume, press the Fn+F4 keys and then press the 

or 

key. 

To decrease volume, press the Fn+F4 keys and then press the 

or 

key. 

Fn+F5  Adjusts the brightness of the computer screen (LCD). 

To increase brightness, press the Fn+F5 keys and then press the 

or 

key. 

To decrease brightness, press the Fn+F5 keys and then press the 

or 

key. 

Fn+F7  Toggles the display between the computer screen (LCD), a connected external display (monitor or TV), and both the
LCD and display. 

Select one display (LCD or external display) when playing a DVD. Connect the TV cable before you turn on the computer;
otherwise, Fn+F7 will not work. You cannot use the Fn+F7 function to switch between LCD and external display once a DVD
is inserted into the optical drive. 
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.