# Fixing Embedded Controller (SSDT-EC/USBX) | Getting Started With ACPI

# # Fixing Embedded Controller (SSDT-EC/USBX)

- Fixing Embedded Controller (SSDT-EC/USBX)
  - What this SSDT does
  - Methods to make this SSDT

## # 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 fake 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:

- Prebuilt
- SSDTTime
- Manual