b03f0a182d
In hybrid mode, the tray icon chip body now fills red (iGPU active) or green (dGPU active) based on whether any process has /dev/nvidia0 open, polled every 5s. Uses fuser instead of runtime_status because nvidia-drm.modeset=1 keeps the PCI device active regardless of user-space usage. Also adds a "Show dGPU processes" menu item (nvidia-smi, hybrid mode only). Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
65 lines
3.1 KiB
Markdown
65 lines
3.1 KiB
Markdown
# Legion GPU Mode Switcher
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A lightweight KDE system tray application for switching GPU modes on Lenovo Legion laptops running the [lenovolegionlinux](https://github.com/johnfanv2/LenovoLegionLinux) driver.
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## Features
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- Shows current GPU mode in the system tray (chip icon: red/green split outline for Hybrid, solid green for NVIDIA only)
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- **In Hybrid mode**, the chip body fills red (iGPU active) or green (dGPU active) to show which GPU is currently doing work — updates every 5 seconds via `/dev/nvidia0` usage detection
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- Switch between **Hybrid** (AMD iGPU drives internal display, NVIDIA exposes HDMI) and **NVIDIA only** (dGPU drives everything) with one click
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- No password prompt for the active desktop session (polkit `allow_active: yes`)
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- Tracks pending mode switches before reboot — shows an orange badge on the icon and allows cancelling the switch
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- Triggers a reboot prompt after switching; also offers "Reboot now" from the tray menu
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- **In Hybrid mode**, shows a "Show dGPU processes" menu item listing which processes are currently using the dGPU (via `nvidia-smi`)
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- Installs itself as a KDE autostart entry
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## Compatibility
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| Component | Requirement |
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|-----------|-------------|
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| Hardware | Lenovo Legion laptop with MUX switch support via lenovolegionlinux |
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| Init system | systemd (for `systemctl reboot`) |
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| Desktop | Any DE with system tray support (KDE, XFCE, …). GNOME on Wayland requires the AppIndicator extension |
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| Autostart | XDG-compliant DEs (`~/.config/autostart/`) |
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Not Arch or KDE specific — works on any systemd-based distro (Ubuntu, Fedora, openSUSE, Debian, etc.) as long as the lenovolegionlinux driver is installed.
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## Tested on
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- **Lenovo Legion 5 Pro Gen 7** (BIOS JUCN66WW)
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- AMD Radeon 680M (iGPU) + NVIDIA GeForce RTX 3070 Ti Laptop GPU
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- KDE Plasma 6.6 on Wayland, kernel 6.18, Manjaro Linux
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> **Note:** This machine requires `force=1` for the legion_laptop module and the `--donotexpecthwmon` flag for `legion_cli`. Other Legion models with full hwmon support may work without these workarounds — the commands would need adjusting in `main.py` and the sudoers/polkit config.
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## Dependencies
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- Python 3.8+
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- PyQt6
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- Arch/Manjaro: `sudo pacman -S python-pyqt6`
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- Ubuntu/Debian: `sudo apt install python3-pyqt6`
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- Fedora: `sudo dnf install python3-qt6`
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- Or via pip: `pip install pyqt6`
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- [lenovolegionlinux](https://github.com/johnfanv2/LenovoLegionLinux) driver (`legion_cli` must be in `$PATH`)
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- polkit (`pkexec`)
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## Installation
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```bash
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git clone https://github.com/pongsn/legion-gpu-mode-switcher.git
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cd legion-gpu-mode-switcher
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sudo bash install.sh
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```
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`install.sh` will:
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1. Install the polkit policy to `/usr/share/polkit-1/actions/` (enables passwordless switching for the active session)
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2. Install the app to `/usr/local/bin/legion-gpu-mode-switcher`
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3. Install the autostart entry to `~/.config/autostart/` (starts on next login)
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## Usage
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```bash
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legion-gpu-mode-switcher &
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```
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Right-click the tray icon to switch GPU mode. A reboot is required for any mode change to take effect — this is a hardware MUX limitation, same as on Windows.
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