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Linux iGPU path for Backlight (#63)

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Laptops/backlight-methods/manual.md
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## Finding the ACPI path
For this guide, we're gonna assume Windows is already on this laptop, as otherwise creating this SSDT is a bit more difficult.
### On MacOS
Unfortunately there is no guidance for this yet. Try on Linux or Windows.
Now open DeviceManager, and head to the following:
### On Linux
These steps work on Ubuntu and may work on other distros. If not then try the procedure for Windows.
Use the `lspci` command to get your display adapters PCI identification number.
The output here will be different on your system!
```
# lspci -D
0000:00:00.0 Host bridge: Intel Corporation 440FX - 82441FX PMC [Natoma] (rev 02)
0000:00:01.0 ISA bridge: Intel Corporation 82371SB PIIX3 ISA [Natoma/Triton II]
0000:00:01.1 IDE interface: Intel Corporation 82371AB/EB/MB PIIX4 IDE (rev 01)
0000:00:02.0 VGA compatible controller: VMware SVGA II Adapter
0000:00:03.0 Ethernet controller: Intel Corporation 82540EM Gigabit Ethernet Controller (rev 02)
0000:00:04.0 System peripheral: InnoTek Systemberatung GmbH VirtualBox Guest Service
```
Search the output for an entry that looks like your display adapter. E.g: In this example we have `VGA compatible controller` with PCI number `0000:00:02.0`. The format of this number is `domain:bus:device:function`.
Now use this command from a Terminal to find the ACPI path for your display adapter
`# cat /sys/class/pci_bus/<domain:bus>/device/<domain:bus:device:function>/firmware_node/path`
For example
```
# cat /sys/class/pci_bus/0000:00/device/0000:00:02.0/firmware_node/path
\_SB_.PCI0.GFX0 <-- The ACPI path
```
Further details [at this link.](https://unix.stackexchange.com/questions/653143/how-to-get-bios-device-name-from-linux-same-as-windows-device-manager-format)
### On Windows
Open DeviceManager, and head to the following:
```
Device Manager -> Display Adapters -> Properties -> Details > BIOS device name