Acer TravelMate 6231 - Manual (Page 47)

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<Fn> + <F8> Speaker toggle Turns the speakers on and off.
<Fn> + <↑> Volume up Increases the sound volume.
<Fn> + <↓> Volume down Decreases the sound volume.
<Fn> + <→> Brightness up Increases the screen brightness.
<Fn> + < ←> Brightness down Decreases the screen brightness.
Hotkey Icon Function Description