Why my screen doesn't light op

[Windows Central Question]

when the alarm sounds or when i receive a message the screen stays black.
I have to push the power button once to light up the screen.

 

[Chintan Gohel]

when the alarm sounds or when i receive a message the screen stays black.
I have to push the power button once to light up the screen.

this is for which device and on which OS?

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