• 🔍 Problem Symptoms
• ✅ Disable USB Autosuspend for the Fingerprint Device
• 🔧 (Optional) Debugging Tools
• 💡 Notes

If your Synaptics fingerprint reader (ID 06cb:0123) stops working after suspend/resume cycles, here’s a practical fix.

§🔍 Problem Symptoms

• fprintd logs show: Ignoring device due to initialization error: endpoint stalled or request not supported

• dmesg shows:

  usb 1-5.4: can't set config #1, error -22
  can't autoresume for authorization: -22
  

• Device fails until reboot unless manually reset.

§✅ Disable USB Autosuspend for the Fingerprint Device

The fingerprint reader struggles with resuming from low-power states. Disable autosuspend to keep it active across suspend cycles.

§Create Udev Rule

sudo vim /etc/udev/rules.d/99-disable-autosuspend-fingerprint.rules

Paste:

# Disable USB autosuspend for Synaptics fingerprint reader
# Laptop: ThinkPad X1 Carbon Gen 13 (Aura Edition)
#
# This Synaptics device (06cb:0123) has issues resuming from suspend when USB autosuspend is enabled.
# After waking from sleep, the fingerprint reader may fail to initialize with a "USB endpoint stalled"
# or "can't set config" error (-22), making fingerprint authentication unavailable until a reboot.
#
# This rule forces the device's power mode to "on" (instead of the default "auto"),
# preventing the kernel from suspending the device and avoiding the resume bug.
#
# Verify:
# cat /sys/bus/usb/devices/1-5.4/power/control
# should return "on" instead of "auto"

ACTION=="add", SUBSYSTEM=="usb", ATTR{idVendor}=="06cb", ATTR{idProduct}=="0123", TEST=="power/control", ATTR{power/control}="on"

Then run:

sudo udevadm control --reload-rules
sudo udevadm trigger

✅ Confirm with:

cat /sys/bus/usb/devices/1-5.4/power/control
# Should say "on"

§🔧 (Optional) Debugging Tools

If you want to inspect what’s going on:

• Trace fprintd startup:

  sudo systemctl stop fprintd.service
  sudo strace -f /usr/libexec/fprintd
  

• Watch device events:

  sudo udevadm monitor --environment --udev
  

• Check the USB tree:

  lsusb | grep -i synap
  

§💡 Notes

• USB autosuspend is often a power-saving optimization, but buggy firmware sometimes breaks resume support.

• This fix ensures the fingerprint reader is always powered, trading a little power for stability.

• Firmware updates via fwupdmgr may help in the future:

  sudo fwupdmgr get-devices
  sudo fwupdmgr update
  

📌 TL;DR: If fingerprint auth breaks after sleep on your Linux laptop, disable autosuspend for the fingerprint USB device and use unbind/bind or authorized toggling as recovery tools. Udev rules can automate the fix.