Problem with light sensor

Hi to all,
I have a problem with the light sensor of my MacBook Pro. The light sensor has always worked until I have manually increased the brightness. From that moment the light sensor does not work anymore.
Can anyone help me please?
Thanks

Have you pressed the F6 key a few times?
Try a SMC reset:
http://support.apple.com/kb/ht3964
Check you settings in System Preferences:
Ciao.

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