Acer 4150, 4650 manual Fn+x Brightness up, Fn+z Brightness down, Fn+F10

Hot Key	Icon	Function	Description
Fn+x		Brightness up	These keys can increase or decrease the brightness of the
			LCD back light. This function should be handled by the
			Analog function within
			the keyboard controller. Brightness will step up/down one
Fn+z		Brightness down	unit as each time these keys are pressed.
Fn+F10		Enter D2D recovery	Enter D2D recovery during POST
		during POST	Launch Acer eRecovery in OS.
		Launch Acer eRecovery
		in OS

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