There are actually buttons on your laptop that are made for changing brightness.
Hold the "fn" key, and press the "Up" button while holding the "fn" key.
Do the same thing to lower the brightness, except hit the down key.
"fn" + "Up" Raise Brightness
"fn" + "Down" Lower Brightness
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SOURCE: i have brought a laptop
Samsung has a built in great power management. It will reduce power brightness to 50% or less if unplug from power cord. <<< it gives more times for power on the battery stays longer. BUT if you demand for some cases eg.PRESENTATION >>> go to CONTROL PANEL >>>power option >>> presentation. APPLY >>> OK
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