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82 lines
2.5 KiB
Markdown
82 lines
2.5 KiB
Markdown
# Fixing Trackpads: Manual
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* [Finding the ACPI path](#finding-the-acpi-path)
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* [Edits to the sample SSDT](#edits-to-the-sample-ssdt)
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* [Compiling the SSDT](#compiling-the-ssdt)
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* [Wrapping up](#wrapping-up)
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## Finding the ACPI path
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Finding the ACPI pathing is quite easy actually, first open your decompiled DSDT you got from [Dumping the DSDT](/Manual/dump.md) and [Decompiling and Compiling](/Manual/compile.md) with either MaciASL(if in macOS) or any other text editor if in Windows or Linux(VSCode has an [ACPI extension](https://marketplace.visualstudio.com/items?itemName=Thog.vscode-asl) that can also help).
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Next search for `Device (GPI0)`. Should give you a result similar to this:
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What we care about from this is the `_STA` method:
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```
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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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```
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What we want is for this to always return `0x0F` when booting macOS, so we want to make an SSDT that will return `GPHD == Zero` in macOS.
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**NOTE that you may have the other way around where GPHD needs to be set as `One` to return `0x0F`**. And your device name may also be different, don't throw random SSDTs in thinking it'll work
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Here's some more examples:
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With this example, we can see that we need both `SBRG` and `GPEN` to return `One`. If only one is present, it'll create some issues so in our SSDT we'll want to have both of them return `One`:
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## Edits to the sample SSDT
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Now that we have our ACPI path, lets grab our SSDT and get to work:
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* [SSDT-GPI0.dsl](https://github.com/dortania/Getting-Started-With-ACPI/blob/master/extra-files/decompiled/SSDT-GPI0.dsl)
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From the second example, we'll want to set both GPEN and SBRG to `One` to allow it to operate in macOS:
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**Before**:
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```
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If (_OSI ("Darwin"))
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{
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GPEN = One <- Proper variables
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}
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```
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Following the example pathing we found, the SSDT should look something like this:
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**After**:
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```
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If (_OSI ("Darwin"))
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{
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GPEN = One <- Change to the right variables
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SBRG = One <- Change to the right variables
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}
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```
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## Compiling the SSDT
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With the SSDT done, you're now [ready to compile the SSDT!](/Manual/compile.md)
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## Wrapping up
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Once you're done making your SSDT, either head to the next page to finish the rest of the SSDTs or head here if you're ready to wrap up:
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* [**Cleanup**](/cleanup.md)
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