I would like to know some information about the issue so that we could help you better.

What is the model number of your HP touchscreen computer?

I appreciate you for providing details about the issue.

I also realize the inconvenience you are experiencing due to brightness issue. I will certainly help you.

This issue may occur due to corrupt or incorrect power and display settings.

I would suggest you to try following methods and check if it helps.

Method 1:
Please run this Microsoft fixit and check.

For reference:

If it does not help, use method 2.

Method 2:
Please use steps provided in this article and check the issue.
Get the best display on your monitor

I hope this information helps.

Please do let us know if you need any further assistance.

Thank you

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