Disable Adaptive Brightness on Windows 8, 8.1 and 10

If you have a newer laptop running Windows 8, 8.1 and 10, you probably have noticed your screen automatically adjusting brightness when switching applications that have light to dark backgrounds, or when working in different lighting conditions. This is due to a feature that makes use of the ambient light sensors on your laptop to automatically adjust your screen's brightness level - aptly named Adaptive Brightness. This can be useful for conserving battery life, but can be annoying when you are trying to focus, read or work.

Disable Adaptive Brightness ( I tested this on Windows 8.1, but should work on both 8 and 10 )

1. Open the Windows Control Panel ( Do Windows key + C on your keyboard to open the Windows Charms, click on Settings and select Control Panel ).
2. From the Control Panel, navigate to Hardware and Sounds > Power Options.
3. On your selected Power Plan, click on Change Plan Settings.
4. Next, find and go to Change advanced power settings.
5. On Power Options, look for Display and click on the plus sign to expand the available options.
6. Expand Enable adaptive brightness and turn off for either On battery or plugged in, or turn off for both.
7. Click on Apply to save changes.

Note: After doing the steps above, you may need to restart your PC for changes to take effect.