I just bought an Inspiron 7500 and can't find any way to disable the backlight from dimming on dark images. I've researched and tried turning off Display Power Savings in the Intel Graphics Command Center, there is no "Adaptive Brightness" option for Display in the power options, updated BIOS to V1.3.1 and could not find any option to disable CABC. It's driving me crazy looking for a way to stop the dimming. Can anyone help??