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Using Power Options to Adjust the Brightness (Windows Vista)
To change the brightness using the Power Options utility, open the Control Panel and
IF USING AC POWER, YOUR BRIGHTNESS SETTING IS SET TO ITS HIGHEST LEVEL BY DEFAULT. IF USING BATTERY POWER, YOUR BRIGHTNESS SETTINGS IS SET TO APPROXIMATELY
THE HIGHER THE BRIGHTNESS LEVEL, THE MORE POWER THE NOTEBOOK WILL CONSUME AND THE FASTER YOUR BATTERIES WILL DISCHARGE. FOR MAXIMUM BATTERY LIFE, MAKE SURE THAT THE BRIGHTNESS IS SET AS LOW AS POSSIBLE.
47 - Display Panel