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95 lines
3.5 KiB
Markdown
95 lines
3.5 KiB
Markdown
# Disabling laptop dGPUs (SSDT-dGPU-Off/NoHybGfx)
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* [What this SSDT does](#what-this-ssdt-does)
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* [Methods to make this SSDT](#methods-to-make-this-ssdt)
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* [Prebuilt](#prebuilts)
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* [SSDTTime](#ssdttime)
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* [Manual](#manual)
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* [Finding the ACPI path](#finding-the-acpi-path)
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* [Edits to the sample SSDT](#edits-to-the-sample-ssdt)
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* [Compiling the SSDT](#compiling-the-ssdt)
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So with laptops, we can hide the dGPU from macOS with the little boot-arg called `-wegnoegpu` from WhateverGreen. But one small problem, the dGPU is still pulling power draining your battery slowly. We'll be going over 2 methods for disabling the dGPU in a laptop:
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* [Optimus Method](/Laptops/laptop-disable.md#optimus-method)
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* [Bumblebee Method](/Laptops/laptop-disable.md#bumblebee-method)
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Note that this is not needed for install, but recommended for post-install
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## Optimus Method
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How this works is that we call the `.off` method found on Optimus GPUs, this is the expected way to power off a GPU but some may find their dGPU will power back up later on. Mainly seen in Lenovo's, the Optimus method should work for most users:
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To start, grab [SSDT-dGPU-Off.dsl](https://github.com/dortania/Getting-Started-With-ACPI/blob/master/extra-files/decompiled/SSDT-dGPU-Off.dsl.zip)
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Next we need to get on Windows, and head to the following:
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```text
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Device Manager -> Display Adapters -> dGPU -> Properties -> Details > BIOS device name
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```
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* Note some GPUs may be hiding under "BIOS device name"
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This should provided you with an ACPI path for your dGPU, most commonly:
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* Nvidia dGPU: `\_SB.PCI0.PEG0.PEGP`
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* AMD dGPU: `\_SB.PCI0.PEGP.DGFX`
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Now with that, we'll need to change the ACPI path in the SSDT. Main sections:
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```text
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External(_SB.PCI0.PEG0.PEGP._OFF, MethodObj)
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```
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```text
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If (CondRefOf(\_SB.PCI0.PEG0.PEGP._OFF)) { \_SB.PCI0.PEG0.PEGP._OFF() }
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```
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Once adapted to your config, head to the compile section
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* For those with sleep issues, you can refer to the original [Rehabman thread](https://www.tonymacx86.com/threads/guide-disabling-discrete-graphics-in-dual-gpu-laptops.163772/)
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## Bumblebee Method
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With some machines, the simple `.off` call won't keep the card off properly, that's where the Bumblebee method comes in. This SSDT will actually send the dGPU into D3 state being the lowest power state a device can support. Credit to Mameo for the original adaptation.
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To start, grab [SSDT-NoHybGfx.dsl](https://github.com/dortania/Getting-Started-With-ACPI/blob/master/extra-files/decompiled/SSDT-NoHybGfx.dsl.zip)
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Next we need to get on Windows, and head to the following:
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```text
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Device Manager -> Display Adapters -> dGPU -> Properties -> Details > BIOS device name
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```
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This should provided you with an ACPI path for your dGPU, most commonly:
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* Nvidia dGPU: `\_SB.PCI0.PEG0.PEGP`
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* AMD dGPU: `\_SB.PCI0.PEGP.DGFX`
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Now with that, we'll need to change the ACPI path in the SSDT. Main sections:
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```text
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External (_SB_.PCI0.PEG0.PEGP._DSM, MethodObj) // dGPU ACPI Path
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External (_SB_.PCI0.PEG0.PEGP._PS3, MethodObj) // dGPU ACPI Path
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```
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```text
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If ((CondRefOf (\_SB.PCI0.PEG0.PEGP._DSM) && CondRefOf (\_SB.PCI0.PEG0.PEGP._PS3)))
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```
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``` text
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// Card Off Request
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\_SB.PCI0.PEG0.PEGP._DSM (ToUUID ("a486d8f8-0bda-471b-a72b-6042a6b5bee0"), 0x0100, 0x1A, Buffer (0x04)
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```
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```text
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// Card Off
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\_SB.PCI0.PEG0.PEGP._PS3 ()
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```
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Once adapted to your config, head to the compile section
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## [Now you're ready to compile the SSDT!](/Manual/compile.md)
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