AskDavis/Getting-Started-With-ACPI
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Avery Black
2021-10-13 00:09:19 -07:00
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Laptops/backlight-methods/manual.md
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@@ -8,12 +8,15 @@
## Finding the ACPI path ## Finding the ACPI path
### On MacOS ### On MacOS
Unfortunately there is no guidance for this yet. Try on Linux or Windows. Unfortunately there is no guidance for this yet. Try on Linux or Windows.
### On Linux ### On Linux
These steps work on Ubuntu and may work on other distros. If not then try the procedure for Windows. 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. Use the `lspci` command to get your display adapters PCI identification number.
The output here will be different on your system! The output here will be different on your system!
``` ```
# lspci -D # lspci -D
0000:00:00.0 Host bridge: Intel Corporation 440FX - 82441FX PMC [Natoma] (rev 02) 0000:00:00.0 Host bridge: Intel Corporation 440FX - 82441FX PMC [Natoma] (rev 02)
@@ -23,16 +26,19 @@ The output here will be different on your system!
0000:00:03.0 Ethernet controller: Intel Corporation 82540EM Gigabit Ethernet Controller (rev 02) 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 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`. 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 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` `# cat /sys/class/pci_bus/<domain:bus>/device/<domain:bus:device:function>/firmware_node/path`
For example For example
``` ```
# cat /sys/class/pci_bus/0000:00/device/0000:00:02.0/firmware_node/path # cat /sys/class/pci_bus/0000:00/device/0000:00:02.0/firmware_node/path
\_SB_.PCI0.GFX0 <-- The ACPI 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) 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 ### On Windows