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The DSDT (Differentiated System Description Table) is the main table in the ACPI part of a computer's BIOS.
The Advanced Configuration and Power Interface (ACPI) defines a large number of tables that provide the interface between an ACPI-compliant operating system and system firmware. These allow description of system hardware in a platform-independent manner in ACPI Machine Language (AML).

  • One of the simplest ways to extract your DSDT from your BIOS is by using DSDT Editor. Once you have downloaded DSDT Editor, open it and press File - Extract DSDT. After 2-15 seconds, your DSDT should appear on the screen. Having a patch for your motherboard is essential to create your own DSDT, if you couldn't find one online.
  • DSDT patching was created with the intention to fix device HPET - High Precision Events Timer. The point is that OS X includes a kext named AppleIntelCPUPowerManagement for power management control (SpeedStep), which - by all means - needs interrupts IRQ 0 and 8. Otherwise it will create a kernel panic.
  • DSDT Database The files linked here are taken directly from a DSDT extract from the specific motherboard, and have been hand edited with minimal edits for CMOS reset (if necessary), UHCI/EHCI, IDE (SATA), PIC/TMR/HPET, SBUS, and HDEF.

The problem is that OS X has an incomplete ACPI implementation which supports only a subset of DSDT. Modifying the DSDT allows the user to better support their hardware. For example, fixing Time Machine and the UUID 35 error is possible after modifying the DSDT.

Mac users interested in Dsdt editor 1.3 generally download: DSDT Editor0.8Free. The main editor windows allows the user to open a DSL file or extract the DSDT from IOReg. It has some useful resources, like syntax highlighting.

For

To patch your DSDT, you must either use a new table file that someone else has provided, or extract and modify your own. Then tell your bootloader to use the new DSDT file instead of the BIOS. On a few motherboards it is also possible to replace the BIOS with an updated BIOS with a patched DSDT.

Preparations

  • Setting Up on Windows

Install AIDA64

AIDA64 is a system information, diagnostics, and auditing program that runs on Microsoft Windows operating systems. It displays detailed information on the components of a computer. Information can be saved to file in formats such as HTML, CSV, or XML. Download and install AIDA64 from official website www.aida64.com

Open AIDA64 → Right Click → ACPI Tool → Save DSDT → Save DSDT As acpi_dsdt.bin

Save Table → Save SSDT As acpi_ssdt-1.bin, acpi_ssdt-2.bin, ...

Video Debug → Video BIOS dump

Rename File

  • Setting Up on OS X

Install DSDT Editor For Mac and Chameleon Wizzard on OS X. Note that DSDT Editor need to have Java Run Time support.

Use open DSDT Editor For Mac acpi_dsdt.aml, press F5 to compile, click Fix Errors, can't have Errors, Warning and Remarks can be temporarily ignored. No Error, save as DSDT.aml, use the same method to create SSDT.

  • Chameleon Wizzard Basic Setting

Put DSDT.aml, SSDT.aml, and graphics rom to /Extra floder.

Dst Formatting

Download

Dsdt mac osDsdt mac os x

Dst Format Image

Chameleon Wizard v4.3.2.zip
DSDTEditor_Mac.zip





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