Brightness Keys not working

[Igor Van loo]

Sometimes when I open my computer the brightness keys stop working specifically, the brighten (F6) key, when I press it makes my computer less bright until it reach 20/100 brightness, if I go lower I can then brighten my computer using F6 key to 20/100 again, I have to manually brighten my computer in the settings but it is not as bright as usual. Very frustrating issue! If anyone has encountered his please let me know!

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