Pixel 4 face unlock finally gains an alertness check

Google is shipping Android's April security patch this week, and with it comes a fix for a long-standing issue with the Pixel 4's face unlock feature. The Pixel 4's face unlock system is finally getting an alertness check, almost a whopping six months after launch.

Google went all-in on a face unlock system for the Pixel 4, removing the fingerprint reader that had been on previous models and using and IR-backed, 3D face scanner as the only biometric system. The Pixel 4 sported a big, lopsided top bezel with all the requisite hardware to build a FaceID-like system, but Google's software left a bit to be desired. The face-scanning system worked even when the user's eyes were closed, so it would be possible to point the phone at the sleeping owner and unlock the phone without their consent. With the new eyes-open check, there's more of a consent factor built into the biometrics.