mirror of
https://github.com/dortania/OpenCore-Legacy-Patcher.git
synced 2026-04-14 04:38:20 +10:00
104 lines
2.9 KiB
Plaintext
104 lines
2.9 KiB
Plaintext
/* Requests power off of dGPU in MacBookPro8,2/3 (TS2 hardware failure)
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* Main goal is to ensure power draw from the dGPU is reduced as
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* much as possible to simulate a hardware demux without actual
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* hardware modifications.
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*
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* Notes:
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* - SSDT must be used in conjuction with '_INI' to 'XINI' patch
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* to reroute PCI0 initialization.
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*
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* - AMD drivers in macOS may still attempt to attach and kernel
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* panic. Disable the dGPU with class-code/device-id spoof or
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* with '-wegnoegpu'.
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*
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* - dGPU will reactivate with sleep-wake, additional process
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* is needed to disable the dGPU.
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* - ie. AMDGPUWakeHandler.kext for macOS
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*
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* Ref:
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* - https://www.tonymacx86.com/threads/help-macbook-pro-disable-radeon-gpu-via-dsdt.164458/
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* - https://github.com/blackgate/AMDGPUWakeHandler
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* - https://help.ubuntu.com/community/MacBookPro8-2/Raring
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*/
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DefinitionBlock ("", "SSDT", 2, "DRTNIA", "dGPU_OFF", 0x00001000)
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{
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External (_SB_.PCI0, DeviceObj)
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External (OSYS)
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Scope (_SB.PCI0)
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{
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OperationRegion (IOGP, SystemIO, 0x0700, 0x51)
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Field (IOGP, ByteAcc, NoLock, Preserve)
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{
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Offset (0x10),
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P710, 8,
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Offset (0x28),
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P728, 8,
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Offset (0x40),
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P740, 8,
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Offset (0x50),
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P750, 8
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}
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Method (_INI, 0, NotSerialized) // _INI: Initialize
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{
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Store (0x07D0, OSYS)
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If (CondRefOf (\_OSI, Local0))
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{
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If (_OSI ("Darwin"))
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{
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Store (0x2710, OSYS)
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}
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If (\_OSI ("Linux"))
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{
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Store (0x03E8, OSYS)
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}
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If (\_OSI ("Windows 2001"))
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{
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Store (0x07D1, OSYS)
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}
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If (\_OSI ("Windows 2001 SP1"))
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{
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Store (0x07D1, OSYS)
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}
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If (\_OSI ("Windows 2001 SP2"))
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{
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Store (0x07D2, OSYS)
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}
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If (\_OSI ("Windows 2006"))
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{
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Store (0x07D6, OSYS)
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}
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If (\_OSI ("Windows 2007"))
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{
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Store (0x07D7, OSYS)
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}
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If (\_OSI ("Windows 2008"))
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{
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Store (0x07D8, OSYS)
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}
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If (\_OSI ("Windows 2009"))
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{
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Store (0x07D9, OSYS)
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}
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}
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// Disables dGPU
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Store ("Requesting dGPU power off", Debug)
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P728 = One // Switch select
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P710 = 0x02 // Switch display
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P740 = 0x02 // Switch DDC
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P750 = Zero // Power down discrete graphics
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}
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}
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}
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