Adaptive Brightness won't turn off permanently

Hello,

This is my first post, apologies if it's in the wrong section.



I'm sure many of you know about that annoying screen dimming on laptops, i have tried disabling it from the Power Options and Intel's HD Graphics Control Panel, but it's still dimming, and it only happens when it's running on batteries and yes i have it disabled on all power plans.





And it always reverts back to "Enable" After a restart:


Disabled:





Enabled after restart:






Anyone's having the same problem?

Please help me on this, it is so annoying.


Laptop: Acer Aspire VN7-791

OS: Windows 8.1 x64