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Why screen dell inspiron 3421 the light up and down?

Updated: 8/20/2019
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10y ago

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i also own dell inspiron 3421 and it also changes its brightness time to time.In my guess,since it states its batttery lives longer,it reduces the brightness and increases it automatically according to its graphics settings.(sorry for bad english)

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10y ago
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Q: Why screen dell inspiron 3421 the light up and down?
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