On windows 10 automatic brightness limits brightness

OK, so ive had problems with my macbook in past years and have installed windows 10 (NOT USING BOOTCAMP!) I erased all partitions and installed windows 10 on it. Its been working fine (with the exception of having to use wifi USB stick and clutch replacement) but one day suddenly I cannot turn the brightness up to 100% unless the light sensor brightness control is off. Anyway I can fix that? Thanks!

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