Acer Aspire 9420 - Manual (Page 53)

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<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