Here are a couple of troubleshooting tips to fix my brightness is stuck on high.
Why can’t I lower the brightness on my laptop?
1. Uninstall Display Driver
If the issue persists, and even if other solutions in this article also did not work, do the following. Install Older Version of Display Adapter
2. Use Registry Editor
Note: After doing this, the lowest brightness level on brightness control will turn off the screen. So, always keep the screen at one level above the lowest one. Also, make sure you adjust the power setting for brightness when in battery mode so that the Windows don’t turn off the screen when in battery saver mode.
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