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HP Compaq Notebook PCs - LCD panel brightness fluctuates and changes

Issue:
LCD panel brightness fluctuates in various lighting conditions or when the unit is moved. This affects units with Ambient light sensors.
Solution
The Ambient light sensor will control the LCD panel brightness in various lighting conditions. To disable the sensor and manually adjust the panel brightness you should follow the steps below.
  1. To disable the sensor, press FN+F11.
  2. If Quick Launch Buttons software is installed you can manually change the setting there as well.
  3. Right click the icon in the system tray (this looks like a rocket).
  4. Click "Turn Ambient light sensor off" to disable it.
  5. To manually adjust the panel brightness you can use FN+F9 to decrease brightness or FN+F10 to increase brightness.

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