Ambient Light Sensor not working?

[Melodeath]

As of today, I noticed my ambient light sensor doesnt seem to work. I tried disabling and re-enabling it in system preferences, but that hasn't done the trick.

Is there some test I can do to see if it's working or not? I know it worked two days ago, because i took the i7 15" MBP outside and it automatically switched to max brightness. Today I took it outside and the brightness didn't switch at all and I couldn't see the screen it was so dark.

Since the last time it definitely worked, all I've done is install Windows 7 64-bit with Boot Camp and hooked up the MBP to an external 20" monitor with a minidisplay-DVI adapter.

Advice? Thanks

 

[Pax]

Try the following
- log out and in again
- reboot
- reset the SMC (see the Apple website)

I had a similar problem and logging out and in again fixed it.

Also the sensor controls the keyboard light. Does your keyboard light go on and off properly (bright light - off, medium light - on brightly, darkness - on dimly).

The sensor is next to the iSight camera at the top of the screen. If you put your thumb over it the display should dim. You will also get a greasy thumb print on the screen .