Archive for April 6th, 2015

by Tom Nelson

The SMC (System Management Controller) controls a number of the Mac’s core functions. The SMC is a chunk of hardware incorporated into the Mac’s motherboard. Its purpose is to free the Mac’s processor from having to actively take care of rudimentary hardware functions.


Spencer Platt/Getty Images News

What the SMC Controls

Depending on your Mac model, the SMC performs the following functions:

  • Responds to the press of the power button, including deciding whether the press is for a power off, sleep, or an accidental misstep by your cat.
  • Detects and responds to the opening or closing of the lid of a portable Mac.
  • Manages a portable’s battery performance, including charging, calibration, and displaying remaining battery time.
  • Thermal management of your Mac’s interior. This is primarily accomplished by sensing temperature at various places inside your Mac, and then adjusting fan speed to create or reduce airflow.

Read more on About: Macs.

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