Here is the process I followed when my screen brightness would not adjust in response to using the buttons on the keyboard, the slider in the settings side tab, or the slider in the power plan section:
Go to the Control Panel
Go to Hardware and Sound
Go to Device Manager under Devices and Printers
Go to Display Adapters
- Click on the item under that heading (In my case, the Intel(R) HD Graphics Family)
Go to the Driver tab in the little window that pops up
Click disable driver (the screen will flash)
Re-enable the same driver (the screen will flash again)
Restart the computer
Et voila! My screen brightness was adjustable for the first time in ages!
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