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This is actually not part of the features of the Intel® HD Graphics drivers, and might be actually like a feature from that Dell* monitor that is being used.
You might try the instructions posted on the URL below, which seems to be similar to what you are seeing
I suggest that you check with DELL directly for further troubleshooting on this matter as this seems to be a feature of the laptop.
For their contact information, you can refer to:
The problem is a default setting in the Intel driver
Go to the Intel Graphics and Media Control panel when you right click and select Graphics Properties from the desktop.
Select ADVANCED MODE
goto MEDIA > IMAGE ENHANCEMENT and disable "Adaptive Contrast Enhancement"
Then GOTO > POWER > Change POWER SOURCE to "On Battery" and make sure "Display Power Saving Technology" is disabled (that is unchecked).
Click APPLY and voila no more dynamic contrast problems!