Brightness adjustment keys (f1 and f2) won't work

My brightness just won't change. I've tried to update the basic display adapter properties, going into that side bar thing that shows up when you hold the mouse over the top left corner and adjust the brightness through that, and i've gone through settings and personalization to try and adjust the brightness and it just won't change. This started today or last night.

I can help if you tell me  the series of pavilion

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