Why the LCD screen is brightened automatically?

Discussion in 'MacBook Pro' started by hajime, Jan 27, 2012.

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  1. hajime, Jan 27, 2012

    hajime macrumors 68040

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    #1
    Hello. I have a MBP 2010 17". At home, I connect it to an external monitor. For the past few days, I left the machine on to backup the data. Before I went to bed, I pressed F1 several times to dim the LCD screen to a complete dark. Then, I went to bed. Few minutes later, the LCD screen was brightened by itself (really scary). This has happened several times already. Anybody knows what happened and how to fix this?
     
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  2. daneoni, Jan 27, 2012

    daneoni macrumors G4

    daneoni

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    #2
    Disable Auto Brightness in Sys Prefs.
     
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  3. hajime, Jan 27, 2012

    hajime thread starter macrumors 68040

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    #3
    Thanks. I will try tonight. The room was completely dark. Why the system adjusted the brightness automatically?
     
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  4. Agent-P, Jan 27, 2012

    Agent-P macrumors 68030

    Agent-P

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    #4
    The room may have been dark, but was the monitor on? That may affect the sensor. When I watch TV in a dark room with my MBP on my lap, the light from the TV reflects off the wall behind me and changes my screen back light according to the changes on the TV. Perhaps you're experiencing something similar.
     
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  5. hajime, Jan 28, 2012

    hajime thread starter macrumors 68040

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    #5
    I switched off the monitor and then reduced the brightness of the LCD screen until the screen was completely black. Then, I went to bed.
     
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  6. alphaod, Jan 28, 2012

    alphaod macrumors Core

    alphaod

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    #6
    Use Control+Shift+Eject to sleep the display.
     
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  7. hajime, Jan 29, 2012

    hajime thread starter macrumors 68040

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    #7
    Thanks for the info. Before I try, could you please tell me how to wake the display? By pressing any key?
     
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