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.
If it does not help, use method 2.
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Please use steps provided in this article and check the issue.
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I hope this information helps.
Please do let us know if you need any further assistance.