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Massive overhaul(hopefully helps new users a bti)

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Mykola Grymalyuk
2020-05-30 23:54:37 -06:00
parent 1f776dfb8c
commit 0c2d4b492d
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Laptops/trackpad.md
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# Fixing Trackpads
# Fixing Trackpads (SSDT-GPI0/XOSI)
* [What this SSDT does](#what-this-ssdt-does)
* [Methods to make this SSDT](#methods-to-make-this-ssdt)
## What this SSDT does
This SSDT is used to force enable our GPI0 for VoodooI2C to connect onto.
With most modern laptop DSDTs, there's a variable called `GPEN` or `GPHD` which are used for setting the status of the GPI0 device. For us, we want to enable the device.
## Finding our GPI0
## Methods to make this SSDT
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 `Device (GPI0)`. Should give you a desult similar to this:
For the trackpad fix, there are 2 methods you can choose from:
![](/images/Laptops/trackpad-md/gpi0.png)
What we care about from this is the `_STA` method:
```
Method (_STA, 0, NotSerialized)
{
If ((GPHD == One))
{
Return (0x03)
}
Return (0x0F)
}
```
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.
**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
Once you found the variable and what it should be set to, grab a copy of [SSDT-GPI0.dsl](https://github.com/dortania/Getting-Started-With-ACPI/blob/master/extra-files/decompiled/SSDT-GPI0.dsl) and make the required edits. Then clean up with compiling it
## More examples
![](/images/Laptops/trackpad-md/gpi0-2.png)
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`:
```
DefinitionBlock("", "SSDT", 2, "ACDT", "GPI0", 0)
{
External(GPEN, FieldUnitObj)
External(SBRG, FieldUnitObj)
Scope (\)
{
If (_OSI ("Darwin"))
{
GPEN = One
SBRG = One
}
}
}
```
## GPIO Troubleshooting
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:
* [SSDT-XOSI](https://github.com/dortania/Getting-Started-With-ACPI/blob/master/extra-files/compiled/SSDT-XOSI.aml)
* XOSI Rename:
| Comment | String | Change _OSI to XOSI |
| :--- | :--- | :--- |
| Enabled | Boolean | YES |
| Count | Number | 0 |
| Limit | Number | 0 |
| Find | Data | 5f4f5349 |
| Replace | Data | 584f5349 |
* [Prebuilt](/Laptops/trackpad-methods/prebuilt.md)
* [Manual](/Laptops/trackpad-methods/manual.md)