Legacy power management not working for Sonoma

[jedrek18]

Hello,

According to the instructions I tried to set up legacy power management on my 8570w with i7-3740QM CPU running Sonoma as turbo boost was not working for me with default config.plist.

Unfortunately, after:

• enabling AppleIntelCPUPowerManagement and AppleIntelCPUPowerManagementClient kexts,
• disabling SSDT-PLUG,
• enabling SSDT-PM aml file generated for my CPU with ssdtPRGen.sh,
• disabling AppleXcpmCfgLock,
• enabling AppleCpuPmLock,
  I'm not able to boot the OS anymore. I get messages about the stall of X86PlatformPlugin (so it appears the OS still tries to use XCPM I suppose?) and after a few minutes the boot process ends with a kernel panic.

Is legacy power management confirmed to work for Sonoma or newer? Any ideas how to fix it?

[SkyrilHD]

It has been a while since I worked on this laptop. The steps you did sound right, however you forgot to change a few settings in the config file:

In ACPI>Delete:

• Enable Delete CpuPm
• Enable Delete Cpu0Ist

In Kernel>Patch:

• Disable _xcpm_bootstrap (Should be the last key; should be unnecessary since it's limited to Monterey)

In Kernel>Quirks:

• Disable AppleXcpmExtraMsrs

I would also try playing around with Kernel>Emulate>DummyPowerManagement

Did you try enabling AppleXcpmForceBoost in Kernel>Quirks?