LegionGoLED

A Decky Loader plugin to toggle the power LED on/off on the Lenovo Legion Go 2 running SteamOS.

Prerequisites

The acpi_call kernel module must be installed. On SteamOS:

sudo steamos-readonly disable
sudo pacman-key --init && sudo pacman-key --populate
sudo pacman -S --noconfirm linux-neptune-618-headers acpi_call-dkms dkms
sudo steamos-readonly enable
sudo modprobe acpi_call

Note: acpi_call must be loaded after each reboot. Add acpi_call to /etc/modules-load.d/acpi_call.conf to auto-load it.

Install

Copy the plugin files to your Decky plugins directory:

sudo mkdir -p ~/homebrew/plugins/LegionGoLED
sudo cp plugin.json main.py ~/homebrew/plugins/LegionGoLED/
sudo cp -r dist ~/homebrew/plugins/LegionGoLED/
sudo systemctl restart plugin_loader.service

Build from Source

Requires Node.js and pnpm:

pnpm install
pnpm build

How It Works

The plugin uses the acpi_call kernel module to invoke Lenovo's WMI method (\_SB.GZFD.WMAF) which controls hardware features on the Legion Go 2. The power LED is Lighting ID 0x03.

See writeup.md for a detailed technical writeup including explanations of ACPI, WMI, kernel modules, and the full investigation process.

License

MIT