AskDavis/Getting-Started-With-ACPI
1
0
Fork 0
mirror of https://github.com/AskDavis/Getting-Started-With-ACPI.git synced 2026-01-01 05:05:57 -08:00
Code Issues Packages Projects Releases Wiki Activity
Files
f97440b4e4f8ba3ef30dfa1100eafb24e585b76c
Getting-Started-With-ACPI/Universal/awac.md
khronokernel f97440b4e4 More stuff
2020-02-04 15:58:36 -07:00

2.0 KiB
Raw Blame History

Fixing System Clocks

What the SSDT-AWAC will do is force enable the Legacy RTC device in macOS, the reason we want to do this is that macOS currently does not support AWAC as a system clock. In some rare cases, there is no Legacy RTC device to force enable so we'll need to create a fake RTC device for macOS to play with using SSDT-RTC0

To determine whether you need SSDT-AWAC or SSDT-RTC0:

  • open your decompiled DSDT and search for Device (AWAC)
  • If nothing shows then no need to continue and no need for this SSDT.
  • If you get a result then you have an AWAC system clock present, then continue with the next search for STAS ==:

As you can see we found the STAS == in our DSDT, this means we're able to force enable our Legacy RTC. In this case, SSDT-AWAC will be used As-Is with no modifications required. Just need to compile.

For systems where no STAS shows up but you do have AWAC, you can use SSDT-RTC0 though you will need to check whether your DSDT uses LPCB, LBC or LBC0.

By default it uses LPCB, you can check by just searching for Name (_ADR, 0x001F0000). This address is used for Low Pin Count devices(LPC) but the device name can vary between LPCB, LBC or LBC0. Just search each one in your config and which ever shows up is the one your system uses: