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ACPI Patches

  1. Download and install MaciASL if you do not have it already.
  2. Dump your original ACPI tables. See Dortania/ ACPI Dump.

  3. In Terminal, disassemble the copied ACPI tables with "iasl -dl DSDT.aml". For our purpose, the only file that really matters is DSDT.dsl

  4. Your DSDT file will be used as a reference table in determining that needs to be patched and what patches need to be added.

  5. Source SSDT*.dsl patch files are located in patches folder.

  6. Refer to my EFI-OpenCore folder to see which patches are currently being used by me.
  7. If your x1c6's model is 20KH*, most of my compiled hotpatches and can likely be copied straight to your setup. However, some patches may require certain directories or variables to be changed depending on your hardware (examine your own disassemebled DSDT). For these, edit the .dsl patch files. Also, note that some SSDT patches also require accompanying OpenCore/ Clover ACPI patches to work.

A good way to see if you need to edit and compile your own SSDT patches is to compare your DSDT.dsl with mine of the same BIOS version. You can find my disassemebled DSDT file in ACPI/Disassembled ACPI/BIOS-v*.

Should your source DSDT be similar enough (in regards to certain items in these ACPI patches)to mine. Congrats! You can simply try my compiled patches. Should it differ however, please carefully examine these notes and create your own SSDT patches.

  1. Once you have the compiled ACPI patches, place them in EFI/OC/ACPI/ and make sure to create matching entries within OpenCore's config.plist's ACPI/Add/ section.

Important Note:

Unlike Clover, where SSDT patches are only being applied when booting macOS. OpenCore will apply SSDT patches regardless of the operating system. This is critical when multi-booting, since Windows and Linux do not need the additional patches that macOS does. In many cases, if Windows/Linux fails to boot under OpenCore, it is likely that your macOS intended SSDT patch(s) is being applied universally. To prevent OpenCore from doing this, it is important that your SSDT patches specify its intended OS, which in our case is "Darwin."
See highlighted example:

OpenCore SSDT patching notice

Note

Network and Display patches are on a case-by-case basis and may differ for everyone.

Non-native WiFi and Bluetooth

  • /patches/Network Patches/ DW1560.plist for DW1560 model cards.
  • /patches/Network Patches/ DW1820A.plist for WD1820A model cards.
  • /patches/Network Patches/ Intel.plist for Intel branded cards.

*Notice that these patches require additional kexts to be installed. See them in Kernel/Add/

ACPI Patches In-Use:

Note

The following patches are arranged alphabetically for easy cross-referencing. For the loading order, please refer to the main EFI's config.plist.

SSDT-AC

Load AppleACPIACAdapter

SSDT-ALS0

Fake Ambient Light Sensor Starting with Catalina, an ambient light sensor device is required for brightness preservation. This patch fakes an ambient light sensor device ALS0 since the x1c6 does not have one.
Why?: ACPI0008 missing in DSDT.

SSDT-Battery

Enables Battery Status in macOS - Single battery system: only BAT0 in ACPI, no BAT1.

SSDT-DMAC

Patch Memory Controller - Why?: PNP0200 is missing in DSDT.

SSDT-Darwin

Detects macOS to enable other patches

SSDT-EC

Alow Reads/Write and Provide an Interface with Embedded Controller via YogaSMC
- Two parts: - Allow access to EC - Sample SSDT from YogaSMC

SSDT-HWAC

Fix axxess to 16byte-EC-field HWAC

SSDT-INIT

Initialize System Variables
- Disables: - HPET - DPTF
- Enables: - DYTC

SSDT-Keyboard

Remap PS2 Keys, EC Keys are handled by BrightnessKeys.kext - Remap 1: PrtSc to F13 - Remap 2: Fn + K to Deadkey - Remap 3: Fn + P to Deadkey - For Fn 1-12 functions, check the following option within Preferences/Keyboard:
Fn keys

SSDT-PM

Enables Native Intel Power Managements
- Why?: Processor search in DSDT, rename PR to other variables as needed.

    Scope (\_PR)
    {
        Processor (PR00, 0x01, 0x00001810, 0x06){}
        Processor (PR01, 0x02, 0x00001810, 0x06){}
        Processor (PR02, 0x03, 0x00001810, 0x06){}
        Processor (PR03, 0x04, 0x00001810, 0x06){}
        Processor (PR04, 0x05, 0x00001810, 0x06){}
        Processor (PR05, 0x06, 0x00001810, 0x06){}
        Processor (PR06, 0x07, 0x00001810, 0x06){}
        Processor (PR07, 0x08, 0x00001810, 0x06){}
        Processor (PR08, 0x09, 0x00001810, 0x06){}
        Processor (PR09, 0x0A, 0x00001810, 0x06){}
        Processor (PR10, 0x0B, 0x00001810, 0x06){}
        Processor (PR11, 0x0C, 0x00001810, 0x06){}
        Processor (PR12, 0x0D, 0x00001810, 0x06){}
        Processor (PR13, 0x0E, 0x00001810, 0x06){}
        Processor (PR14, 0x0F, 0x00001810, 0x06){}
        Processor (PR15, 0x10, 0x00001810, 0x06){}
    }

SSDT-PMCR

  • Why?: PMCR,APP9876 missing in DSDT.

SSDT-PNLF

Enables Brightness Management in macOS - iGPU is PCI0.GFX0
- Why?: Skylake/ KabyLake/ KabyLake-R CPU.
- Used in conjunction with WhateverGreen.kext.

SSDT-PWRB

  • Why?: PNP0C0C missing in DSDT.
  • Patch power button.

SSDT-Sleep

Patch macOS Sleep, S3, and S0 under Windows Dual Boot - Comprehensive sleep/wake patch.
- Fixes restart on shutdown. Needs OpenCore Patches/ Sleep.plist

SSDT-TB-DSB0 to SSDT-TB-DSB6

  • Patch USB 3.1
  • Patch Thunderbolt 3 Hotplug
  • Patch Thunderbolt 3 Power Management
  • Patch Thunderbolt 3 native interfacing with macOS's System Report

SSDT-XHC1 - USB 2.0/3.0

Needs OpenCore Patches/ XHC1.plist - Map USB 2.0/3.0 - Patch USB Power Properties