Adapted from:

7910634 {5462604:PNLKTXD5} 1 chicago-fullnote-bibliography 50 default 1217 https://karljurgen.feuerherm.ca/wp-content/plugins/zotpress/
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Apple Support. “How to Reset the SMC of Your Mac.” Accessed November 14, 2020. https://support.apple.com/en-us/HT201295.

The system management controller (SMC) is responsible for managing behaviour related to these features:

  • Power, including the power button and power to the USB ports
  • Battery and charging
  • Fans and other thermal-management features
  • Indicators or sensors such as status indicator lights (sleep status, battery charging status, and others), the sudden motion sensor, the ambient light sensor, and keyboard backlighting, and
  • Behaviour when opening and closing the lid of a notebook computer.

Resetting the SMC doesn’t affect the contents of NVRAM or PRAM.