Screen goes black when pressing lower brightness button

[Guest warlou cinco]

Hello!When I press the "lower brightness" button, my screen goes black, and it returns to normal when pressing the "higher brightness" button.For example, if my brightness is set to 100%, and I press the "lower brightness" button once, my screen goes black immediately; if I keep pressing it multiple times, though my screen is black, the brightness level will go down as normal. The screen turns on again with the corresponding brightness level once I press the "higher brightness" button again.Windows specs:acer Aspire A515-44

 

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