When working in the dark and computer plugged in, I lowered the screen brightness using Fn+down arrow key. The next morning I could only brighten it several "notches." I can make it very bright when on battery power, but it dims way down when I plug it in. It shows it's at 100, but it is very dim. I've upgraded the BIOS to A06, but that did nothing. Downloading and running Dell Diagnostics also did nothing to help.
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