Manual was complete and available promptly, since I had lost my original manual. Very good response.
Text excerpt from page 25 (click to view)
Turning On Your Computer
If necessary, adjust the brightness controls for the LCD display as follows:
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Your computer is equipped with a Brightness button, located next to the Power button. Pressing it will adjust the LCD screen brightness. To increase brightness, press the Fn+F5 keys, and then press the Up Arrow key or Right Arrow key . To decrease brightness, press the Fn+F5 keys, and then press the Down Arrow key or Left Arrow key .