Auto-Brightness Help Please!

Discussion in 'iPhone' started by dan-K, Sep 28, 2016.

  1. dan-K macrumors regular

    Joined:
    Sep 19, 2012
    #1
    Hi All,

    Apologies in advance if this is a silly question!

    I currently have auto-brightness enabled. Sometimes I find I want the screen brighter than what auto-brightness sets it as, so I open control center and manually slide the brightness bar up to my desired brightness (with auto-brightness still enabled).

    When does auto-brightness kick in again? Is it after a set time? Or do I have to go to setting and turn it off then turn it back on again?

    Hope this makes sense!

    Dan
     
  2. coolio93 macrumors 6502

    Joined:
    Apr 15, 2013
    Location:
    Houston, TX
    #2
    From my experience, it kicks back in after the lighting environment significantly changes
     
  3. now i see it macrumors 68000

    Joined:
    Jan 2, 2002
    #3
    When it's turned on, it's always on. An algorithm determines a set brightness based on the front ambient light sensor. You can then adjust the brightness to your desired level and it will auto-adjust from that setting.
    When the phone is turned off, it defaults to its preset original setting again. (Not your setting last used).
     
  4. dan-K thread starter macrumors regular

    Joined:
    Sep 19, 2012
    #4
    Perfect, that explains it! Thanks! :)
     
  5. Aceroller macrumors member

    Joined:
    Sep 29, 2015
    #5
    Seems like when I have auto brightness on and then I manually turn the control center toggle all the way up, it just stays there regardless of lighting environment. I have to go back to settings and toggle auto brightness off then back on to engage it again.
     
  6. Atomic Walrus macrumors 6502a

    Joined:
    Sep 24, 2012
    #6
    What’s happening is that you’re basically calibrating the auto brightness; you’re telling it “at the current ambient light, I want this brightness.”

    The auto-brightness algorithm then uses this in its calculations, so if you turned it up to 100% in a fairly dim environment it will no longer get darker than 100% unless the ambient light falls below that level.

    I use this on all my devices to slightly increase the minimum brightness.

    When you enable/disable auto brightness it will reset this “calibration.”
     

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