Hi guys
I have this problem.
I turned off my laptop's adaptive brightness off in both plugged in and on battery mode.
The problem appears to happen on dark theme program.
When I open Steam on my laptop(plugged in), the screen stays right,no reduction in brightness or contrast.
When I switch to battery mode, the screen dims and it becomes pretty dark. But when i switch to desktop or chrome, the screen returns back to normal again.This also happens when I play dota 2 on battery mode but not in plugged in mode.

Laptop Specs
CPU: Intel Core i7-4700MQ
RAM: 8GB 1600MHz
OS: Windows 8.1