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When I unplug the mains adaptor on my laptop the screen goes brighter and then duller when the mains reapplied. How do I change it around


Answers :

This is usually a BIOS adjustable feature. During startup, press the proper key (*) to enter BIOS. Look for LCD or something that would deal with brightness. Make the adjustment as desired.
You can adjust the brightness while running the computer using (usually) the function key and the brightness key. But only the BIOS adjustment will be permanent.

(*) Each computer manufacturer has their own key to get into BIOS so Google for your brand to see which key it is. Usually f2 or f10.
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