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69 lines
2.0 KiB
Markdown
69 lines
2.0 KiB
Markdown
# Fixing Backlight: 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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For this guide, we're gonna assume Windows is already on this laptop, as otherwise creating this SSDT is a bit more difficult.
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Now open DeviceManager, and head to the following:
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```
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Device Manager -> Display Adapters -> Properties -> Details > BIOS device name
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```
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* Note some GPU ACPI pathing may be hiding under "BIOS device name"
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From the above example, we can see our display is hooked up to `PCI0.GFX0`
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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-PNLF.dsl](https://github.com/acidanthera/OpenCorePkg/tree/master/Docs/AcpiSamples/Source/SSDT-PNLF.dsl)
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* [SSDT-PNLFCFL.dsl](https://github.com/acidanthera/OpenCorePkg/tree/master/Docs/AcpiSamples/Source/SSDT-PNLFCFL.dsl)
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* For Coffee Lake and newer
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By default, this uses `PCI0.GFX0` for the pathing. you'll want to rename accordingly. For this example, we'll assume your pathing is `PCI0.GPU0`:
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**Before**:
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```
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External (_SB_.PCI0.GFX0, DeviceObj) <- Rename this
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Scope (_SB.PCI0.GFX0) <- Rename this
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Device(_SB.PCI0.GFX0.PNLF) <- Rename this
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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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External (_SB_.PCI0.GPU0, DeviceObj) <- Renamed
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Scope (_SB.PCI0.GPU0) <- Renamed
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Device(_SB.PCI0.GPU0.PNLF) <- Renamed
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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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