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

Add more mobile notes

Browse Source
This commit is contained in:
Mykola Grymalyuk
2020-03-20 15:20:26 -06:00
parent dfdb6229a1
commit 608312274d
4 changed files with 31 additions and 9 deletions
Download Patch File Download Diff File Expand all files Collapse all files

18
Universal/awac.md
View File

@@ -1,6 +1,16 @@
# Fixing System Clocks
**For Intel 300 series chipsets only**
**For Intel 300 series chipsets and newer**, this also includes X299 refreshes and Icelake laptops. Common machines:
* X299X (10th Gen refresh)
* B360
* B365
* H310
* H370
* Z370 (Gigabtye and AsRock boards with newer BIOS versions)
* Z390
* 400 series (Cometlake)
* 495 series (Icelake)
So on newer Intel 300 series motherboards, manufactueres started pushing for a new type of system clock: **AWAC**( **A** **W**eird **A**ss **C**lock). One small problem, macOS doesn't know what the hell an AWAC clock is instead only familiar with the legacy **RTC**(**R**eal **T**ime **C**lock). So we need to figure out how to bring back the old clock, thats where `SSDT-AWAC` and `SSDT-RTC0` come in:
@@ -20,14 +30,14 @@ Note: AWAC actually stands for ACPI Wake Alarm Counter/Clock for those curious,
To determine whether you need [SSDT-AWAC](https://github.com/acidanthera/OpenCorePkg/blob/master/Docs/AcpiSamples/SSDT-AWAC.dsl) or [SSDT-RTC0](https://github.com/acidanthera/OpenCorePkg/blob/master/Docs/AcpiSamples/SSDT-RTC0.dsl):
* open your decompiled DSDT and search for `Device (AWAC)`
* If nothing shows then no need to continue and no need for this SSDT as you have no AWAC. Otherwise, continue on!
* If you get a result then you have an `AWAC` system clock present, then continue with the next search for `STAS ==`:
* If **nothing shows up** then no need to continue and **no need for this SSDT** as you have no AWAC. **Otherwise, continue on!**
* If you get a result then you have an `AWAC` system clock present, then continue with the **next search for `STAS ==`**:
![](https://i.imgur.com/uuUF857.png)
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](https://github.com/acidanthera/OpenCorePkg/blob/master/Docs/AcpiSamples/SSDT-AWAC.dsl) will be used As-Is with no modifications required. Just need to compile. Note that `STAS` may be found in AWAC first instead of RTC like in our example, this is normal.
For systems where no `STAS` shows up **but** you do have `AWAC`, you can use [SSDT-RTC0](https://github.com/acidanthera/OpenCorePkg/blob/master/Docs/AcpiSamples/SSDT-RTC0.dsl) though you will need to check the naming of LPC in your DSDT
For systems where **no `STAS`** shows up **but** you do have `AWAC`, you can use [SSDT-RTC0](https://github.com/acidanthera/OpenCorePkg/blob/master/Docs/AcpiSamples/SSDT-RTC0.dsl) though you will need to check the naming of LPC in your DSDT
By default the SSDT uses `LPCB`, you can check what your system uses 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`: