Sony VGC-V - Manual (Page 30)

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Using Your VAIO Computer
Combinations and Functions with the Fn Key (VGC-V620G only)
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Some functions are not available until Windows is launched.
Combinations/Feature Functions
Fn + % (F2): speaker switch Turns on and off the built-in speakers and the headphones.
Fn + 2 (F3/F4): speaker volume Adjusts the built-in speaker volume.
To increase volume, press Fn+F4 and then
M or , , or keep pressing Fn+F4.
To decrease volume, press Fn+F3 and then m or < , or keep pressing Fn+F3.
Fn + 8 (F5/F6): brightness control Adjusts the brightness of the LCD.
To increase lightness intensity, press Fn+F6 and then
M or , , or keep pressing Fn+F6.
To decrease lightness intensity, press Fn+F5 and then m or < , or keep pressing Fn+F5.