Hi Songmoooon,
I'm Benedict, an Independent Advisor and a Microsoft user like you. Sorry to hear that, I'm here to help and work with you in your concerns.
Kindly update or reinstall that Surface Panel Filter, to do this just follow the steps below:
- Right-click on the Surface Panel Filter and select "Update Driver".
- Next select "Search Automatically..."
- Restart your computer.
Kindly observe if you can now control your brightness normally and if the error icon in the Surface Panel Filter has gone. If not, kindly proceed to the next solution:
- Right-click on the Surface Panel Filter and select "Uninstall device".
- Restart your computer.
Please let me know how it goes.
Sincerely,
Benedict P.
Independent Advisor