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Getting Started With ACPI
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Dumping the DSDT
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Disabling desktop dGPUs
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Trackpad GPI0
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Disabling laptop dGPUs
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Embedded Controller
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AWAC vs RTC
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NVRAM PMC
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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=".." >Trackpad GPI0</a>
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</h1>
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<blockquote>
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<p><em>Last modified: Mon May 11 2020 01:31:14 GMT+0000 (Coordinated Universal Time)</em></p>
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</blockquote>
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<h1 id="fixing-trackpads"><a name="fixing-trackpads" class="plugin-anchor" href="#fixing-trackpads"><i class="fa fa-link" aria-hidden="true"></i></a>Fixing Trackpads</h1>
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<p>This SSDT is used to force enable our GPI0 for VoodooI2C to connect onto.</p>
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<p>With most modern laptop DSDTs, there's a variable called <code>GPEN</code> or <code>GPHD</code> which are used for setting the status of the GPI0 device. For us, we want to enable the device.</p>
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<h2 id="finding-our-gpi0"><a name="finding-our-gpi0" class="plugin-anchor" href="#finding-our-gpi0"><i class="fa fa-link" aria-hidden="true"></i></a>Finding our GPI0</h2>
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<p>So first things we need to do is find out what variable is used to enable our GPI0 device, lets open up our decompiled SSDT and search for <code>Device (GPI0)</code>. Should give you a desult similar to this:</p>
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<p><img src="../images/Laptops/trackpad-md/gpi0.png" alt=""></p>
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<p>What we care about from this is the <code>_STA</code> method:</p>
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<pre><code>Method (_STA, 0, NotSerialized)
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{
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If ((GPHD == One))
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{
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Return (0x03)
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}
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Return (0x0F)
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}
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</code></pre><p>What we want is for this to always return <code>0x0F</code> when booting macOS, so we want to make an SSDT that will return <code>GPHD == Zero</code> in macOS.</p>
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<p><strong>NOTE that you may have the other way around where GPHD needs to be set as <code>One</code> to return <code>0x0F</code></strong>. And your device name may also be different, don't throw random SSDTs in thinking it'll work</p>
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<p>Once you found the variable and what it should be set to, grab a copy of <a href="https://github.com/dortania/Getting-Started-With-ACPI/blob/master/extra-files/SSDT-GPI0.dsl" target="_blank">SSDT-GPI0.dsl</a> and make the required edits. Then clean up with compiling it</p>
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<h2 id="more-examples"><a name="more-examples" class="plugin-anchor" href="#more-examples"><i class="fa fa-link" aria-hidden="true"></i></a>More examples</h2>
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<p><img src="../images/Laptops/trackpad-md/gpi0-2.png" alt=""></p>
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<p>With this example, we can see that we need both <code>SBRG</code> and <code>GPEN</code> to return <code>One</code>. If only one is present, it'll create some issues so in our SSDT we'll want to have both of them return <code>One</code>:</p>
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<pre><code>DefinitionBlock("", "SSDT", 2, "ACDT", "GPI0", 0)
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{
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External(GPEN, FieldUnitObj)
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External(SBRG, FieldUnitObj)
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Scope (\)
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{
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If (_OSI ("Darwin"))
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{
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GPEN = One
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SBRG = One
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}
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}
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}
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</code></pre><h2 id="gpio-troubleshooting"><a name="gpio-troubleshooting" class="plugin-anchor" href="#gpio-troubleshooting"><i class="fa fa-link" aria-hidden="true"></i></a>GPIO Troubleshooting</h2>
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<p>So if you're still having issues enabling your trackpad in macOS, you can try removing SSDT-GPIO and instead swap for the following. Note that using these 2 will most likely break Windows and Linux so only use XOSI when troubleshooting:</p>
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<ul>
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<li><p><a href="https://github.com/hackintosh-guides/vanilla-laptop-guide/tree/master/Misc-files/SSDT-XOSI.aml" target="_blank">SSDT-XOSI</a></p>
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</li>
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<li><p>XOSI Rename:</p>
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</li>
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</ul>
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<table>
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<thead>
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<tr>
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<th style="text-align:left">Comment</th>
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<th style="text-align:left">String</th>
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<th style="text-align:left">Change _OSI to XOSI</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td style="text-align:left">Enabled</td>
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<td style="text-align:left">Boolean</td>
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<td style="text-align:left">YES</td>
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</tr>
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<tr>
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<td style="text-align:left">Count</td>
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<td style="text-align:left">Number</td>
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<td style="text-align:left">0</td>
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</tr>
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<tr>
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<td style="text-align:left">Limit</td>
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<td style="text-align:left">Nuber</td>
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<td style="text-align:left">0</td>
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</tr>
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<tr>
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<td style="text-align:left">Find</td>
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<td style="text-align:left">Data</td>
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<td style="text-align:left">5f4f5349</td>
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</tr>
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<tr>
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<td style="text-align:left">Replace</td>
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<td style="text-align:left">Data</td>
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<td style="text-align:left">584f5349</td>
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</tr>
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</tbody>
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</section>
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