My Device : Redmi 2 Prime (2014818) Problem : Whenever we unlock device the colors of display becomes dull so we have go to again and apply Settings>Display>Colors and Saturation>Standard\Brilliant. Than the display looks great. But if device is locked and unlocked than the colors again becomes dull. We have to again reapply the above settings. Hello, I have been used All latest (Global Stable, Global Dev., SMIUI 6.1.28, Original 6.1.28) all have such problem. Please do something.