Ambient Light Sensor Question

Discussion in 'iPhone' started by jck1634, Jul 17, 2010.

  1. jck1634 macrumors regular


    Mar 16, 2009
    I was wondering if someone could help me. I've done a forum search and so far only come up with issues with the proximity sensor.

    The iPhone 4 I have is a black box replacement from an Apple store. It does have the pesky problem with the proximity sensor, but I have an additional issue with the ambient light sensor.
    For some reason the phone has a hard time telling if the room I'm in is dark or brightly lit. The brightness goes down whenever the room goes dark. If I point it to a light source (e.g. my laptop screen) the brightness goes up again. I'm sure this is supposed to be the other way round, right?

    the questions I'm asking are, does anyone know if this is part of the same issue with the proximity sensor? Has anyone else noticed this?

    I've made another appointment at the "Genius" bar (term used very loosely :p) but thought I'd ask on here as well.

    Any help much appreciated. :)
  2. blurb23 macrumors 6502a

    Feb 25, 2007
    That is the correct behavior.

    Whenever you are in a dimly lit room, the brightness of the screen will go DOWN.

    Whenever you are in a brightly lit room, the brightness of the screen will go UP.
  3. jck1634 thread starter macrumors regular


    Mar 16, 2009
    Really? I assumed it would have been the other way round. Thanks for your help.
  4. Carnivor macrumors regular


    Feb 24, 2008
    Its the right behaviour, imagine waking up at 3am on-call and the screen is at full brightness, it'd burn your retina's out with the uber retina display, and you'll spend 10 seconds blearily trying to see who's calling you.

    from that perspective i find the feature great, but i also find it annoying when im in a dark room and playing a game, some games its just to dim. so i end up sliding up the brightness, or turning autodim off
  5. ple001 macrumors newbie

    Jul 10, 2010
    It's true that it's the correct behavior, but I do think the iPhone 4 has some issues in this regard -- it often, but not always, seems to overcompensate in dark rooms. My 3G never had such trouble determining the correct level. The 4 seems completely schizophrenic in comparison.

    Seems somewhat related to the proximity sensor's issues -- hopefully that fix will take care of this as well.

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