Hi@RoyalAlice, Welcome to the HP Support Community!
Thank you for posting on the HP Support Community.
- Did this happen after a recent window or software update?
- When was the last time it worked fine?
- Have you tried any troubleshooting steps?
While you respond to that, let's try these steps:
- Go to Control Panel
- Hardware and Sound
- Power Options, then click on "Change plan settings" next to your active power plan. Click on "Change advanced power settings." Scroll down to Display, then under Enable adaptive brightness, switch it off for both the battery and plugged in modes
Hope this helps! Keep me posted.
Please click “Accept as Solution” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos, Thumbs Up" on the bottom right to say “Thanks” for helping!
Have a great day!