Last modified: Tue Jun 02 2020 13:56:37 GMT+0000 (Coordinated Universal Time)

Fixing Embedded Controller (SSDT-EC/USBX)

What this SSDT does

The purpose of SSDT-EC/UBX is a couple things:

  • On desktops, the EC(or better known as the embedded controller) isn't compatible with AppleACPIEC driver, to get around this we disable this device when running macOS
  • AppleBusPowerController will look for a device named EC, so we will want to create a fake device for this kext to load onto
    • AppleBusPowerController also requires a USBX device to supply USB power properties for Skylake and newer, so we will bundle this device in with the EC fix
  • On laptops, the EC is used for hotkeys and battery so disabling this isn't all too ideal. Problem is our EC's name isn't compatible, so we will create a simple "fake" EC device that will satisfy Apple

So TL;DR:

  • EC is embedded controller
  • Desktops will want real EC off, and a fake EC created
  • Laptops will just want an additional fale EC present
  • Skylake and newer devices will want USBX as well

Methods to make this SSDT

For the EC fix, there are 3 methods you can choose from:

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