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GPU Spoof
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<a href=".." >GPU Spoof</a>
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<html><head></head><body><blockquote>
<p><em>Last modified: Thu Jun 18 2020 15:35:29 GMT+0000 (Coordinated Universal Time)</em></p>
</blockquote>
<h1 id="renaming-gpus-ssdt-gpu-spoof"><a name="renaming-gpus-ssdt-gpu-spoof" class="plugin-anchor" href="#renaming-gpus-ssdt-gpu-spoof"><i class="fa fa-link" aria-hidden="true"></i></a>Renaming GPUs (SSDT-GPU-SPOOF)</h1>
<p>So this is mainly needed for GPUs that are not natively supported out of the box due to their names, most commonly:</p>
<ul>
<li>R9 290/390</li>
<li>R9 280/380</li>
<li>R7 270/370</li>
<li>R9 260/360</li>
<li>R7 250</li>
<li>R7 240</li>
</ul>
<p>Instead, these GPUs need to be &quot;spoofed&quot; or faked into a model that closely matches theirs, generally this will be the &quot;X&quot; variant of the card. For some reason Apple never bothered adding the PCI IDs for these other cards even though their GPU cores are supported by the driver.</p>
<p>So to spoof the GPU, we need to find a couple things:</p>
<ul>
<li>Suitable PCI ID for the GPU</li>
<li>ACPI Path of the GPU</li>
<li><a href="https://github.com/dortania/Getting-Started-With-ACPI/blob/master/extra-files/decompiled/SSDT-GPU-SPOOF.dsl.zip" target="_blank">SSDT-GPU-SPOOF</a></li>
</ul>
<h2 id="finding-a-suitable-pci-id"><a name="finding-a-suitable-pci-id" class="plugin-anchor" href="#finding-a-suitable-pci-id"><i class="fa fa-link" aria-hidden="true"></i></a>Finding a suitable PCI ID</h2>
<p>To find a suitable PCI ID, we&apos;ll be using <a href="https://pci-ids.ucw.cz/read/PC/1002" target="_blank">PCI ID Repository</a> which has a full database of all AMD GPUs. For this example, we&apos;ll be creating a Spoof SSDT for the R9 390. For a full list of supported GPUs, please see the <a href="https://dortania.github.io/GPU-Buyers-Guide/" target="_blank">GPU Buyers Guide</a>. The closest match to this GPU would be the 390X, and looking on that site near the top gives us this:</p>
<pre><code>Vendor 1002 -&gt; Device 1002:67b0
</code></pre><p>Now lets break this down into a device ID we can use:</p>
<ul>
<li><code>1002</code>: The vendor ID, all AMD devices have this ID</li>
<li><code>67B0</code>: The device ID, this is what we care about</li>
</ul>
<p>So how do we convert this to a fake ID? Well the format of a fake ID:</p>
<pre><code>&quot;device-id&quot;,
Buffer (0x04)
{
0xB0, 0x67, 0x00, 0x00
},
</code></pre><p>As you can see, the bytes are swapped in pairs. Keep this in mind when we make our SSDT</p>
<p>The specifics are due to <a href="https://en.wikipedia.org/wiki/Endianness" target="_blank">Endianness</a> for those who are curious</p>
<h2 id="finding-the-acpi-path-of-the-gpu"><a name="finding-the-acpi-path-of-the-gpu" class="plugin-anchor" href="#finding-the-acpi-path-of-the-gpu"><i class="fa fa-link" aria-hidden="true"></i></a>Finding the ACPI Path of the GPU</h2>
<p>To find the PCI path of a GPU is fairly simple, best way to find it is running Windows:</p>
<ul>
<li>Open Device Manager</li>
<li>Select Display Adapters, then right click your GPU and select Properties</li>
<li>Under the Details Tab, search for &quot;Location Paths&quot;<ul>
<li>Note some GPUs may be hiding under &quot;BIOS device name&quot;</li>
</ul>
</li>
</ul>
<p><img src="../images/Desktops/amd.png" alt=""></p>
<p><img src="../images/Desktops/nvidia.png" alt="Credit to 1Revenger1 for the image"></p>
<p>The second &quot;ACPI&quot; is what we care about:</p>
<pre><code>ACPI(_SB_)#ACPI(PC02)#ACPI(BR2A)#ACPI(PEGP)#PCI(0000)#PCI(0000)
</code></pre><p>Now converting this to an ACPI path is quite simple, remove the <code>#ACPI</code> and <code>#PCI(0000)</code>:</p>
<pre><code>`_SB_.PC02.BR2A.PEGP
</code></pre><p>And voila! We&apos;ve found our ACPI path, now that we have everything we&apos;re ready to get cooking</p>
<h2 id="making-the-ssdt"><a name="making-the-ssdt" class="plugin-anchor" href="#making-the-ssdt"><i class="fa fa-link" aria-hidden="true"></i></a>Making the SSDT</h2>
<p>To start grab our <a href="https://github.com/dortania/Getting-Started-With-ACPI/blob/master/extra-files/decompiled/SSDT-GPU-SPOOF.dsl.zip" target="_blank">SSDT-GPU-SPOOF</a> and open it up. Here there&apos;s a couple things to change:</p>
<pre><code>External (_SB_.PCI0, DeviceObj)
External (_SB_.PCI0.PEG0.PEGP, DeviceObj)
</code></pre><p>For our example, we&apos;ll change all mentions of :</p>
<ul>
<li><code>PCI0</code> with <code>PC02</code></li>
<li><code>PEG0</code> with <code>BR2A</code></li>
</ul>
<p>Hint: If your ACPI path is a bit shorter than the example, this is fine. Just make sure the ACPI paths are correct to your device.</p>
<p>Now that the ACPI pathing is correct, we can finally apply our fake ID!!!</p>
<p>So the 2 parts we want to change:</p>
<p><strong>device ID</strong>:</p>
<pre><code>&quot;device-id&quot;,
Buffer (0x04)
{
0xB0, 0x67, 0x00, 0x00
},
</code></pre><p><strong>Model</strong>:</p>
<pre><code>&quot;model&quot;,
Buffer ()
{
&quot;AMD Radeon R9 390&quot;
}
</code></pre><p><code>&quot;device-id&quot;</code> will be set to our PCI ID that we found in &quot;Finding a suitable PCI ID&quot; and <code>&quot;model&quot;</code> is mainly cosmetic</p>
<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&apos;re ready to compile the SSDT!</a></h2>
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