Can't disable dynamic contrast ratio (or auto brightness) on new gaming PC
Solution 1:
what worked for me was to disable "Diplay power saving technology" from Intel HD Graphics control panel. you can access it from Power settings of the Intel HD Graphics control panel.
Solution 2:
The implementation of dynamic contrast ratio (often implemented in conjunction with changes in screen backlight levels) is specific to video driver software.
ATI / AMD video drivers
Dynamic contrast (Vari-Bright™) can be disabled in the AMD Catalyst Control Center under "PowerPlay™" by clicking on the yellow areas as shown in the screenshot below:
