AskDavis/Getting-Started-With-ACPI
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Add dGPU disable support

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Mykola Grymalyuk
2020-04-02 17:18:38 -06:00
parent 8acedca403
commit 942c1632ca
6 changed files with 32 additions and 13 deletions
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3
Laptops/backlight.md
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@@ -16,3 +16,6 @@ If Windows has been installed on the device, you can also do the following:
```text
Device Manager -> Display Adapters -> Properties -> Details > BIOS device name
```
* Note some GPUs may be hiding under "BIOS device name"
![Credit to 1Revenger1 for the image](https://cdn.discordapp.com/attachments/683011276938543134/695396807739441232/unknown-4.png)

33
Laptops/laptop-disable.md
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@@ -5,6 +5,8 @@ So with laptops, we can hide the dGPU from macOS with the little boot-arg called
* [Optimus Method](/Laptops/laptop-disable.md#optimus-method)
* [Bumblebee Method](/Laptops/laptop-disable.md#bumblebee-method)
Note that this is not needed for install, but recommended for post-install
## Optimus Method
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:
@@ -17,17 +19,21 @@ Next we need to get on Windows, and head to the following:
```text
Device Manager -> Display Adapters -> dGPU -> Properties -> Details > BIOS device name
```
* Note some GPUs may be hiding under "BIOS device name"
This should provided you with an ACPI path for your dGPU, most commonly:
* Nvidia dGPU: `\_SB.PCI0.PEG0.PEGP`
* AMD dGPU: `\_SB.PCI0.PEGP.DGFX`
![Credit to 1Revenger1 for the image](https://cdn.discordapp.com/attachments/683011276938543134/695396807739441232/unknown-4.png)
Now with that, we'll need to change the ACPI path in the SSDT. Main sections:
```text
External(_SB.PCI0.PEG0.PEGP._OFF, MethodObj) // ACPI Path of dGPU
```text
External(_SB.PCI0.PEG0.PEGP._OFF, MethodObj)
```
```text
If (CondRefOf(\_SB.PCI0.PEG0.PEGP._OFF)) { \_SB.PCI0.PEG0.PEGP._OFF() }
@@ -35,10 +41,12 @@ If (CondRefOf(\_SB.PCI0.PEG0.PEGP._OFF)) { \_SB.PCI0.PEG0.PEGP._OFF() }
Once adapted to your config, head to the compile section
* 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/)
## Bumblebee Method
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. Creit to Mameo for the original adaptation
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.
To start, grab [SSDT-NoHybGfx.dsl](https://github.com/khronokernel/Getting-Started-With-ACPI/blob/master/extra-files/SSDT-NoHybGfx.dsl.zip)
@@ -62,15 +70,16 @@ External (_SB_.PCI0.PEG0.PEGP._PS3, MethodObj) // dGPU ACPI Path
```text
If ((CondRefOf (\_SB.PCI0.PEG0.PEGP._DSM) && CondRefOf (\_SB.PCI0.PEG0.PEGP._PS3)))
{
// Card Off Request
\_SB.PCI0.PEG0.PEGP._DSM (ToUUID ("a486d8f8-0bda-471b-a72b-6042a6b5bee0"), 0x0100, 0x1A, Buffer (0x04)
{
0x01, 0x00, 0x00, 0x03
})
// Card Off
\_SB.PCI0.PEG0.PEGP._PS3 ()
}
```
``` text
// Card Off Request
\_SB.PCI0.PEG0.PEGP._DSM (ToUUID ("a486d8f8-0bda-471b-a72b-6042a6b5bee0"), 0x0100, 0x1A, Buffer (0x04)
```
```text
// Card Off
\_SB.PCI0.PEG0.PEGP._PS3 ()
```
Once adapted to your config, head to the compile section