added yoga6 fingerprint support post

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content/post/yoga6-fingerprint-arch.md

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+---
+title: "Fingerprint Support on Lenovo Yoga 6 with Arch Linux"
+date: 2025-09-23
+lastmod: 2025-09-23
+categories: ["Blog"]
+tags: ["linux", "archlinux", "hardware"]
+---
+Got a Lenovo Yoga 6 2-in-1 and frustrated that your fingerprint reader isn't working on Arch Linux? You're not alone. The standard fprintd package doesn't include the necessary firmware for this laptop's Synaptics sensor.
+
+<!--more-->
+
+# The Problem
+
+The Lenovo Yoga 6 2-in-1 laptop comes with a Synaptics fingerprint sensor that requires proprietary firmware not included in the standard fprintd package. Without this firmware, fprintd can't communicate with the sensor, leaving you with a non-functional fingerprint reader.
+
+# The Solution
+
+The AUR package `libfprint-2-tod1-synatudor-git` provides the necessary Touch-On-Display (TOD) driver and firmware for Synaptics sensors, including the one in the Yoga 6.
+
+## Installation Steps
+
+1. **Install the AUR package:**
+```bash
+yay -S libfprint-2-tod1-synatudor-git
+```
+Or if you're using paru:
+```bash
+paru -S libfprint-2-tod1-synatudor-git
+```
+
+2. **Install fprintd (if not already installed):**
+```bash
+sudo pacman -S fprintd
+```
+
+3. **Enable and start the fprintd service:**
+```bash
+sudo systemctl enable --now fprintd.service
+```
+
+4. **Verify the fingerprint reader is detected:**
+```bash
+fprintd-list-devices
+```
+
+You should see output listing your Synaptics sensor.
+
+## Setting Up Fingerprints
+
+Once the driver is installed and working:
+
+1. **Enroll your fingerprints:**
+```bash
+fprintd-enroll
+```
+Follow the prompts to scan your finger multiple times.
+
+2. **Test authentication:**
+```bash
+fprintd-verify
+```
+
+## PAM Integration
+
+To use fingerprint authentication for system login and authentication, add fingerprint support to the appropriate PAM configuration files:
+
+1. **For system login**, add to `/etc/pam.d/system-local-login`:
+```
+auth      sufficient pam_fprintd.so
+```
+
+2. **For display managers**, the configuration may already exist:
+   - SDDM: `/etc/pam.d/sddm` should have `auth sufficient pam_fprintd.so`
+   - LightDM: `/etc/pam.d/lightdm` should have `auth sufficient pam_fprintd.so`
+
+3. **For sudo authentication**, add to `/etc/pam.d/sudo`:
+```
+auth sufficient pam_fprintd.so
+```
+
+The `sufficient` directive means fingerprint authentication will be attempted first, falling back to password if fingerprint fails.
+
+# Why This Works
+
+The `libfprint-2-tod1-synatudor-git` package provides:
+- The proprietary Synaptics firmware blob required by the sensor
+- The TOD (Touch-On-Display) driver implementation for libfprint2
+- Proper USB device ID mappings for various Synaptics sensors
+
+Without this package, fprintd only has access to open-source drivers that don't support the proprietary communication protocol used by many modern fingerprint sensors.
+
+# Troubleshooting
+
+If the fingerprint reader still doesn't work:
+
+1. **Check USB device detection:**
+```bash
+lsusb | grep -i synaptics
+```
+
+2. **Review fprintd logs:**
+```bash
+journalctl -u fprintd -b
+```
+
+3. **Ensure secure boot is disabled** - some proprietary firmware doesn't load with secure boot enabled.
+
+4. **Reboot after installation** - the driver may need a fresh start to properly initialize.
+
+# Final Notes
+
+While it's unfortunate that proprietary firmware is required, this AUR package makes fingerprint authentication possible on the Yoga 6 and similar laptops with Synaptics sensors. The convenience of fingerprint login, especially on a 2-in-1 device, is worth the extra installation step.