pongsn 4e13f08b07 Redesign icon, fix dGPU process detection, polish menu

- Replace chip-outline icon with a GPU card shape (PCIe card body,
  two cooling fans, gold contact fingers) — fixes color stripping
  introduced by Qt 6.11 + KDE Plasma 6.6 tray icon colorization
- Active GPU indicator: yellow-tinted fan disc + bright ring on the
  active side in Hybrid mode (replaces the invisible 2px hub dot)
- dGPU process list now scans /proc/<pid>/fd for open NVIDIA devices
  instead of nvidia-smi --query-compute-apps, so graphics/rendering
  processes (Lutris, games, Vulkan/OpenGL apps) are included
- "Show dGPU processes" menu item is now hidden unless the dGPU is
  actually active (was shown whenever mode == hybrid)
- Menu labels changed from AMD/NVIDIA to generic iGPU/dGPU
- Popup dialogs now inherit the tray icon via QApplication.setWindowIcon

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

2026-06-30 00:58:48 -05:00

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Legion GPU Mode Switcher

A lightweight KDE system tray application for switching GPU modes on Lenovo Legion laptops running the lenovolegionlinux driver.

Features

Shows current GPU mode in the system tray — GPU card icon (PCIe card body with two cooling fans and gold contact fingers): red/green split for Hybrid, solid green for dGPU only
In Hybrid mode, the fan on the active GPU's side glows yellow to show which GPU is currently doing work — updates every 5 seconds via /dev/nvidia* usage detection
Switch between Hybrid (iGPU + dGPU) and dGPU only with one click — menu labels are hardware-agnostic (iGPU/dGPU rather than AMD/NVIDIA)
No password prompt for the active desktop session (polkit allow_active: yes)
Tracks pending mode switches before reboot — shows an orange badge on the icon and allows cancelling the switch
Triggers a reboot prompt after switching; also offers "Reboot now" from the tray menu
Shows a "Show dGPU processes" menu item only when the dGPU is actually in use; lists all processes with an NVIDIA device open (graphics and compute — detected via /proc/<pid>/fd, not just CUDA via nvidia-smi)
Popup dialogs share the same tray icon
Installs itself as a KDE autostart entry

Compatibility

Component	Requirement
Hardware	Lenovo Legion laptop with MUX switch support via lenovolegionlinux
Init system	systemd (for `systemctl reboot`)
Desktop	Any DE with system tray support (KDE, XFCE, …). GNOME on Wayland requires the AppIndicator extension
Autostart	XDG-compliant DEs (`~/.config/autostart/`)

Not Arch or KDE specific — works on any systemd-based distro (Ubuntu, Fedora, openSUSE, Debian, etc.) as long as the lenovolegionlinux driver is installed.

Tested on

Lenovo Legion 5 Pro Gen 7 (BIOS JUCN66WW)
AMD Radeon 680M (iGPU) + NVIDIA GeForce RTX 3070 Ti Laptop GPU
KDE Plasma 6.6 on Wayland, kernel 6.18, Manjaro Linux

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.

Dependencies

Python 3.8+
PyQt6
- Arch/Manjaro: sudo pacman -S python-pyqt6
- Ubuntu/Debian: sudo apt install python3-pyqt6
- Fedora: sudo dnf install python3-qt6
- Or via pip: pip install pyqt6
lenovolegionlinux driver (legion_cli must be in $PATH)
polkit (pkexec)

Installation

git clone https://github.com/pongsn/legion-gpu-mode-switcher.git
cd legion-gpu-mode-switcher
sudo bash install.sh

install.sh will:

Install the polkit policy to /usr/share/polkit-1/actions/ (enables passwordless switching for the active session)
Install the app to /usr/local/bin/legion-gpu-mode-switcher
Install the autostart entry to ~/.config/autostart/ (starts on next login)

Usage

legion-gpu-mode-switcher &

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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