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Getting Started With ACPI
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Decompiling and Compiling
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Disabling desktop dGPUs
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Disabling laptop dGPUs
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AWAC vs RTC
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IRQ Fix
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GPU Spoof
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Fixing SMBus Support
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Cleanup
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Troubleshooting
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Contributing
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<!-- Title -->
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<h1>
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<i class="fa fa-circle-o-notch fa-spin"></i>
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<a href=".." >Disabling laptop dGPUs</a>
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</h1>
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<blockquote>
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<p><em>Last modified: Sun Apr 26 2020 02:41:33 GMT+0000 (Coordinated Universal Time)</em></p>
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</blockquote>
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<h1 id="disabling-laptop-dgpus"><a name="disabling-laptop-dgpus" class="plugin-anchor" href="#disabling-laptop-dgpus"><i class="fa fa-link" aria-hidden="true"></i></a>Disabling laptop dGPUs</h1>
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<p>So with laptops, we can hide the dGPU from macOS with the little boot-arg called <code>-wegnoegpu</code> 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:</p>
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<ul>
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<li><a href="laptop-disable.html#optimus-method">Optimus Method</a></li>
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<li><a href="laptop-disable.html#bumblebee-method">Bumblebee Method</a></li>
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</ul>
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<p>Note that this is not needed for install, but recommended for post-install</p>
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<h2 id="optimus-method"><a name="optimus-method" class="plugin-anchor" href="#optimus-method"><i class="fa fa-link" aria-hidden="true"></i></a>Optimus Method</h2>
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<p>How this works is that we call the <code>.off</code> 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:</p>
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<p>To start, grab <a href="https://github.com/dortania/Getting-Started-With-ACPI/blob/master/extra-files/SSDT-dGPU-Off.dsl.zip" target="_blank">SSDT-dGPU-Off.dsl</a></p>
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<p>Next we need to get on Windows, and head to the following:</p>
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<pre><code class="lang-text">Device Manager -> Display Adapters -> dGPU -> Properties -> Details > BIOS device name
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</code></pre>
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<ul>
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<li>Note some GPUs may be hiding under "BIOS device name"</li>
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</ul>
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<p>This should provided you with an ACPI path for your dGPU, most commonly:</p>
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<ul>
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<li>Nvidia dGPU: <code>\_SB.PCI0.PEG0.PEGP</code></li>
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<li>AMD dGPU: <code>\_SB.PCI0.PEGP.DGFX</code></li>
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</ul>
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<p><img src="../images/Desktops/nvidia.png" alt="Credit to 1Revenger1 for the image"></p>
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<p>Now with that, we'll need to change the ACPI path in the SSDT. Main sections:</p>
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<pre><code class="lang-text">External(_SB.PCI0.PEG0.PEGP._OFF, MethodObj)
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</code></pre>
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<pre><code class="lang-text">If (CondRefOf(\_SB.PCI0.PEG0.PEGP._OFF)) { \_SB.PCI0.PEG0.PEGP._OFF() }
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</code></pre>
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<p>Once adapted to your config, head to the compile section</p>
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<ul>
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<li>For those with sleep issues, you can refer to the original <a href="https://www.tonymacx86.com/threads/guide-disabling-discrete-graphics-in-dual-gpu-laptops.163772/" target="_blank">Rehabman thread</a></li>
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</ul>
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<h2 id="bumblebee-method"><a name="bumblebee-method" class="plugin-anchor" href="#bumblebee-method"><i class="fa fa-link" aria-hidden="true"></i></a>Bumblebee Method</h2>
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<p>With some machines, the simple <code>.off</code> 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.</p>
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<p>To start, grab <a href="https://github.com/dortania/Getting-Started-With-ACPI/blob/master/extra-files/SSDT-NoHybGfx.dsl.zip" target="_blank">SSDT-NoHybGfx.dsl</a></p>
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<p>Next we need to get on Windows, and head to the following:</p>
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<pre><code class="lang-text">Device Manager -> Display Adapters -> dGPU -> Properties -> Details > BIOS device name
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</code></pre>
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<p>This should provided you with an ACPI path for your dGPU, most commonly:</p>
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<ul>
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<li>Nvidia dGPU: <code>\_SB.PCI0.PEG0.PEGP</code></li>
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<li>AMD dGPU: <code>\_SB.PCI0.PEGP.DGFX</code></li>
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</ul>
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<p>Now with that, we'll need to change the ACPI path in the SSDT. Main sections:</p>
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<pre><code class="lang-text">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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</code></pre>
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<pre><code class="lang-text">If ((CondRefOf (\_SB.PCI0.PEG0.PEGP._DSM) && CondRefOf (\_SB.PCI0.PEG0.PEGP._PS3)))
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</code></pre>
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<pre><code class="lang-text"> // 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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</code></pre>
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<pre><code class="lang-text"> // Card Off
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\_SB.PCI0.PEG0.PEGP._PS3 ()
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</code></pre>
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<p>Once adapted to your config, head to the compile section</p>
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<h2 id="now-youre-ready-to-compile-the-ssdt"><a name="now-youre-ready-to-compile-the-ssdt" class="plugin-anchor" href="#now-youre-ready-to-compile-the-ssdt"><i class="fa fa-link" aria-hidden="true"></i></a><a href="../Manual/compile.html">Now you're ready to compile the SSDT!</a></h2>
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