What settings does the PRAM/NVRAM keep in Macs? (exactly)

By rodion15
Feb 26, 2016
Post New Reply
  1. I did some tests on resetting the PRAM/NVRAM in different known-good macs and was surprised to see varying results:

    What I did is to adjust sound volume and screen brightness in OS X to minimum and then shut down the machine and reset the PRAM: in one iMac the screen brighness wasn't reset, that is: it remained at minimum after restarting (even during startup). Yet the sound volume was reset to a medium level (startup chime and then in OS X).

    On an macbook: I did the same, but the PRAM reset didn't reset neither the sound volume nor the screen brightness, they remained at minimum.

    On another macbook: I removed the battery and the power adapter and these settings were reset to an intermediate value.

    So my doubt is: where does a mac save these settings other than the PRAM (now called NVRAM)?
    How can the screen brightness be kept at minimum after resetting the NVRAM? where's this saved? in the SMC?

Similar Topics

Add your comment to this article

You need to be a member to leave a comment. Join thousands of tech enthusiasts and participate.
TechSpot Account You may also...