Brightness automatically back to 100%

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Jul 8, 2016
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Hello

After I installed Windows 10, my laptop (Vaio) screen brightness always turn back to 100%. For example, I just set the brightness to 75% and it will automatically turn back to 100% after just 1-2 minutes or sometimes just 3 seconds. I've already turn off the auto brightness. I also tried setting brightness by creating new power plan and set brightness below 100% on both plugged in and on battery but it still didn't work. No matter how I set the brightness, by clicking battery indicator on the taskbar or power options in control panel, it always turn back to 100% which is too bright :(.

What should I do to solve this problem?

Thank you
 

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