mbp 13 late 2013 auto brightness not working

Discussion in 'MacBook Pro' started by tea88, Dec 21, 2014.

  1. tea88 macrumors newbie

    May 6, 2014
    hi guys,

    i discovered my auto brightness is not working anymore while i was using my laptop during the night and the brightness failed to adjust and it was just too bright.

    I've tried ticking and unpicking the auto brightness checkbox and restarting.
    problem still there.

    also i am sure it was working fine on mavericks, it might have been something with yosemite update.

    any help guys?
  2. sevoneone macrumors 6502

    May 16, 2010
    Try a PRAM reset: Command+Option+P+R immediately on boot (before the chime). Hold down the key combination, until the Mac chimes for the 3rd time, then release the keys and allow the system to boot.
  3. tea88 thread starter macrumors newbie

    May 6, 2014
    thank you for your reply, is this safe to do. Should i do a backup before attempting this?

    sorry i am very new to this as this is my first mac.
  4. yjchua95 macrumors 604

    Apr 23, 2011
    GVA, KUL, MEL (current), ZQN
    It's safe.

    No backups needed.
  5. sevoneone macrumors 6502

    May 16, 2010
    You should always have a backup ;-) , but resetting the PRAM(nvram) has no more risk to your data than an ordinary boot.

    NVRAM stands for Non-Volatile Random Access Memory, it is used to store several preference setting related to hardware. (Back in the days when Macs ran on PowerPC chips it was called Parameter RAM, hence why it is still called a PRAM reset and the Key Combo is still Command-Option-P-R) It stores things like screen brightness, keyboard backlight, volume and startup disk settings. Just like any RAM it is possible for data to get corrupted from time to time. Resetting zeros it out and the OS writes default values in for all the settings on the next boot.

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