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WoFPR (Wake on Fingerprint Reader) sensors that support a wake on fingerprint reader capability are wake-capable (and thus maintain a connection to power) during Modern Standby, enabling the ability to initiate captures and therefore wake a PC from Modern Standby.
Expected Behavior
To produce wake on fingerprint reader behavior, follow the below configurations:
| Is Modern Standby enabled? | Is the power cut to the sensor? | Resulting WoFPR Behavior |
|---|---|---|
| Modern Standby (S0 Low Power Idle) | No | Enabled |
| Modern Standby (S0 Low Power Idle) | Yes | Disabled |
| Traditional Sleep (S3) | Yes / No | Not Supported |
| Hibernate (S4) | Yes / No | Not Supported |
Additionally, the fingerprint used must be properly enrolled in order to produce wake on fingerprint reader behavior. To enroll a fingerprint, go to Settings > Sign-in options > Windows Hello Fingerprint.
Driver/Firmware/Software Considerations
Do not cut power to the sensor during Modern Standby. To support wake on fingerprint reader, the system must supply power to the sensor during Modern Standby.
Secure sensors will not exhibit WoFPR behavior. Secure sensors are sensors that have implemented the Secure Connection Protocol and have a Microsoft-issued cert to verify that they can operate in a secure mode. This is a subset of the secure biometric feature that includes both face and fingerprint. OEMs decide what hardware to put in their systems and, if they want secure biometrics (which is also a feature of secured-core PCs), they must choose from a list of approved modules. Please refer to Sensor Requirements for Secure Biometrics for more information.
Validation
Validate a touch fingerprint sensor on a Modern Standby system by:
- Putting the device in Modern Standby (recommended session length is 10+ minutes).
- Touching fingerprint sensor using a properly enrolled fingerprint.
- If the system wakes up, WoFPR behavior is working.
- Check the System Power Report for exit reason 44 (Pdc Signal: Fingerprint) to verify that the correct exit reason was logged.
The system should also pass the Modern Standby Basic HLK test.