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<li class="chapter " data-level="1.3" >
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<li class="chapter " data-level="1.3" data-path="../ssdt-long.html">
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SSDTs: Long Way
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<li class="chapter " data-level="4.2" data-path="../Laptops/backlight.md">
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<li class="chapter " data-level="4.2" data-path="../Laptops/backlight.html">
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Backlight PNLF
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<li class="chapter " data-level="4.3" data-path="../Laptops/trackpad.md">
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Trackpad GPIO
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<li class="chapter " data-level="5.4" data-path="xosi.html">
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XOSI
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<li class="header">Cleanup</li>
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<li class="chapter " data-level="5.5" data-path="irq.html">
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<a href="irq.html">
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IRQ Fix
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<h1 id="fixing-system-clocks">Fixing System Clocks</h1>
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<p>What the <a href="https://github.com/acidanthera/OpenCorePkg/blob/master/Docs/AcpiSamples/SSDT-AWAC.dsl" target="_blank">SSDT-AWAC</a> will do is force enable the Legacy RTC device in macOS, the reason we want to do this is that macOS currently does not support AWAC as a system clock. In some rare cases, there is no Legacy RTC device to force enable so we'll need to create a fake RTC device for macOS to play with using <a href="https://github.com/acidanthera/OpenCorePkg/blob/master/Docs/AcpiSamples/SSDT-RTC0.dsl" target="_blank">SSDT-RTC0</a></p>
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<p>To determine whether you need <a href="https://github.com/acidanthera/OpenCorePkg/blob/master/Docs/AcpiSamples/SSDT-AWAC.dsl" target="_blank">SSDT-AWAC</a> or <a href="https://github.com/acidanthera/OpenCorePkg/blob/master/Docs/AcpiSamples/SSDT-RTC0.dsl" target="_blank">SSDT-RTC0</a>, open your decompiled DSDT and search for <code>Device (AWAC)</code>. If you get a result then you have an <code>AWAC</code> system clock present, <strong>if nothing shows then no need to continue and no need for this SSDT</strong>. Otherwise, continue with the next search for <code>STAS ==</code>:</p>
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<p>To determine whether you need <a href="https://github.com/acidanthera/OpenCorePkg/blob/master/Docs/AcpiSamples/SSDT-AWAC.dsl" target="_blank">SSDT-AWAC</a> or <a href="https://github.com/acidanthera/OpenCorePkg/blob/master/Docs/AcpiSamples/SSDT-RTC0.dsl" target="_blank">SSDT-RTC0</a>:</p>
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<ul>
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<li>open your decompiled DSDT and search for <code>Device (AWAC)</code></li>
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<li>If nothing shows then no need to continue and no need for this SSDT. </li>
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<li>If you get a result then you have an <code>AWAC</code> system clock present, then continue with the next search for <code>STAS ==</code>:</li>
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</ul>
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<p><img src="https://i.imgur.com/uuUF857.png" alt=""></p>
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<p>As you can see we found the <code>STAS ==</code> in our DSDT, this means we're able to force enable our Legacy RTC. In this case, <a href="https://github.com/acidanthera/OpenCorePkg/blob/master/Docs/AcpiSamples/SSDT-AWAC.dsl" target="_blank">SSDT-AWAC</a> will be used As-Is with no modifications required. Just need to compile.</p>
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<p>For systems where no <code>STAS</code> shows up but you do have <code>AWAC</code>, you can use <a href="https://github.com/acidanthera/OpenCorePkg/blob/master/Docs/AcpiSamples/SSDT-RTC0.dsl" target="_blank">SSDT-RTC0</a> though you will need to check whether your DSDT uses <code>LPCB</code>, <code>LBC</code> or <code>LBC0</code>. </p>
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<p>By default it uses <code>LPCB</code>, you can check by just searching for <code>Name (_ADR, 0x001F0000)</code>. This address is used for Low Pin Count devices(LPC) but the device name can vary between <code>LPCB</code>, <code>LBC</code> or <code>LBC0</code>. Just search each one in your config and which ever shows up is the one your system uses</p>
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<p>For systems where no <code>STAS</code> shows up <strong>but</strong> you do have <code>AWAC</code>, you can use <a href="https://github.com/acidanthera/OpenCorePkg/blob/master/Docs/AcpiSamples/SSDT-RTC0.dsl" target="_blank">SSDT-RTC0</a> though you will need to check whether your DSDT uses <code>LPCB</code>, <code>LBC</code> or <code>LBC0</code>. </p>
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<p>By default it uses <code>LPCB</code>, you can check by just searching for <code>Name (_ADR, 0x001F0000)</code>. This address is used for Low Pin Count devices(LPC) but the device name can vary between <code>LPCB</code>, <code>LBC</code> or <code>LBC0</code>. Just search each one in your config and which ever shows up is the one your system uses:</p>
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<p><img src="https://cdn.discordapp.com/attachments/456913818467958789/670148514197667840/Screen_Shot_2020-01-23_at_11.08.30_PM.png" alt=""></p>
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