Set Up Facial Recognition Login on Linux with Howdy

Introduction

Switching to Linux often brings a sense of freedom and control, but you might miss the convenience of Windows Hello’s face unlock. While fingerprint login can be tricky due to varying vendor and developer support, a free and open-source app called Howdy brings Windows Hello-style facial recognition to your Linux machine. This guide walks you through the entire process—from checking hardware compatibility to testing your new login method. By the end, you'll unlock your Linux system with just a glance.

What You Need

• A laptop or desktop running a modern Linux distribution (Ubuntu 20.04+, Fedora 33+, or similar)
• An infrared (IR) camera or a standard webcam that can capture clear facial images (most built-in webcams work, but IR provides better low-light performance)
• Administrative (sudo) access to install software
• An internet connection for downloading packages
• Basic familiarity with the terminal

Step-by-Step Guide

Step 1: Verify Your Camera and System Compatibility

Howdy relies on a video device to capture your face. Before installing, confirm that Linux detects your camera. Open a terminal and run:

ls /dev/video*

If you see /dev/video0 (or a similar number), your system has a video device. For best results, use an infrared camera—many ThinkPads and Dell laptops include one. If you only have a standard webcam, ensure good lighting during setup.

Step 2: Install Howdy

Howdy is not always in default repositories, so you may need to add a PPA (Ubuntu) or use a COPR (Fedora). For Ubuntu/Debian-based systems:

sudo add-apt-repository ppa:boltgolt/howdy
sudo apt update
sudo apt install howdy

For Fedora:

sudo dnf copr enable lkiesow/howdy
sudo dnf install howdy

Arch Linux users can install from the AUR (e.g., yay -S howdy). During installation, you may be prompted to confirm dependencies—answer yes.

Step 3: Configure Howdy’s Camera Settings

After installation, edit the configuration file with elevated privileges:

sudo nano /lib/security/howdy/config.ini

Find the line # device_path = /dev/video0 and uncomment it (remove the #) if your camera is video0. If using a different device, change the path accordingly. Save and exit (Ctrl+O, Ctrl+X in nano).

For IR cameras, you may also need to adjust the video_source or specify the correct device_path. Refer to Howdy’s documentation for advanced camera tuning.

Step 4: Add Your Face Model to Howdy

Now it’s time to train Howdy to recognize you. Run the following command and follow the prompts:

sudo howdy add

You’ll be asked to look at the camera steadily. A good practice is to rotate your head slightly left and right during capture. The process takes about 10–20 seconds. You can add multiple people or retake your face by using sudo howdy add --label "your_name".

Step 5: Test Face Unlock

Lock your screen (Super+L or xdg-screensaver lock) and then wake the display. You should see a new authentication prompt: Howdy will attempt to recognize your face. If successful, the screen unlocks automatically after a moment. If it fails, check lighting or repeat Step 4 in better conditions.

Step 6: (Optional) Fine-Tune Behavior

Howdy works with PAM, the Pluggable Authentication Module, meaning it can unlock any PAM-aware service (sudo, screen lock, etc.). You can adjust sensitivity in config.ini under the [core] section:

• confirm_sensitivity – Higher values make Howdy less strict (more chance of false accept). Default 3.0.
• timeout – How long the camera stays on after detecting a face. Default 5 seconds.

Experiment with these values to balance convenience and security.

Tips and Troubleshooting

Final Tips for a Smooth Experience

• Lighting matters: Standard webcams struggle in dim environments. Use a desk lamp or rely on IR if available.
• Multiple faces: You can add face models for other users by switching to their account and running sudo howdy add.
• Fallback authentication: Howdy does not replace your password—if face unlock fails, the usual password prompt appears. Keep your password safe.
• Security note: Howdy uses face images stored locally; they are not uploaded anywhere. Still, treat it as a convenience feature, not a high-security tool.
• Update regularly: Howdy is actively developed. Check for updates via your package manager to get bug fixes and improvements.
• If Howdy doesn’t start: Ensure the video device exists (ls /dev/video*) and that you have read/write permissions. You can add your user to the video group: sudo usermod -aG video $USER, then log out and back in.

With Howdy installed and configured, you’ve successfully brought Windows Hello-style face unlock to Linux. Enjoy the seamless login experience every time you sit down at your machine.