My XPS changes the brightness of the screen depending on the content of the screen. This gets very annoying because while programming, highlighting different amounts of text and lines changes the color and brightness. I've updated my BIOS to the newest version I could (1.4.0) and have also checked the Intel Graphics Command Center, but cannot find a setting that would turn it off, such as adaptive brightness or dynamic brightness.
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This is an LCD feature to save more power in battery mode for this system mode.
After updating BIOS to 1.1.0 we need to disable EcoPower in BIOS settings.
Press F2 continuously on laptop restart when dell logo is shown, then go to Video section and disable EcoPower and also you can set brightness level as per your needs.
Please refer below 2 images for better understanding.