Windows 7 Brightness Not working – Dell Precision – M4600/6600 nVidia Optimus

If you have Windows 7, a Dell Precision Laptop with nVidia Quadro 1000M or 2000M with Optimus enabled and your brightness is not working…add this registry key and restart.

Windows Registry Editor Version 5.00





  1. Hi,
    I am a little unsure how to add this.

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