Ambient Light Sensor not working?

Discussion in 'MacBook Pro' started by Melodeath, May 16, 2010.

  1. Melodeath macrumors 6502a

    Dec 9, 2009
    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
  2. Pax macrumors 6502a

    Dec 12, 2003
    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 :).

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