Aspire E15 brightness is locked to maximum capacity. Won't let me change it

My Aspire E15 brightness is locked to maximum capacity. I can not change it in options power, or with the Fn key. It is the same whether or not connected to the power adapter. While using the Fn key and pressing Fn + left key or Fn + right key, brightness indicator screen alternates between two levels, but the brightness of the screen does not change. Thanks for your help.

Please reinstall the graphics driver video once and try it:

Here is the driver download link:
http://global-download.Acer.com/GDFiles/driver/VGA/VGA_Intel_10.18.10.3574_W81x64_A.zip?acerid=63552...

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Tags: Acer Laptops

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