Aquaris X2 changes brightness depending on content

Hi, i just got the aquaris x2 and this issue is annoying me a lot. With autobrightness OFF, the display changes abruptly its brightness according to the content displayed. For instance, whiter content makes brightness to be higher, and darker content makes brightness to be lower. You can see the brightness change few miliseconds after the content change. I don't believe it can be a feature, it's nonsense and really annoying because it's not smooth at all. Any ideas to fix this? I'm waiting...

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