Windows 11 Fingerprint Reader intermittent disconnects.

Was asked to submit this as a new solution and not a comment to another user.

Symptom:
The fingerprint reader intermittently disappears (becomes unavailable) on the Windows login/lock screen.

Temporary Workaround:
Physically unplug and reconnect the USB fingerprint reader.

Root Cause:
Windows power management cuts power or suspends upstream USB hubs during sleep or idle states, causing the biometric device to disconnect or fail to reinitialize.

Permanent Fix

Disable USB power-saving features along the connection path between the fingerprint reader and the motherboard.

Resolution Steps:

1. Open Device Manager:
   Press Win + X and select Device Manager.
2. Switch to Connection View:
   In the top menu, go to View → Devices by connection.
3. Locate the Fingerprint Reader:
   Expand the tree to find your biometric device.
4. Disable Power Saving on Upstream Hubs:
   For each USB Root Hub or Generic USB Hub sitting directly between the reader and the system:
   • Right-click the hub and select Properties.
   • Switch to the Power Management tab.
   • Uncheck "Allow the computer to turn off this device to save power".
   • Click OK.
5. Repeat for any other parent USB hubs in that specific device tree.

Hope this helps anyone experiencing the same issue!