How to change brightness on dell laptop

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The problem is the screen dims every time you unplug the charger and I’m afraid something might be wrong with it. She says it’s normal for a laptop to dim the screen when the charger is unplugged, but my old laptop never did that. She went and found another laptop with Windows 8.1 on it and she offered to sell me the one with Windows 10 for half what she paid for it. Question from Charlene: My friend bought a new Dell laptop a couple of months ago but she hates it because she can’t get used to Windows 10.