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The blank timer was gated on `authenticating`, which is `authenticatingPassword || fingerprintAuthenticating`. The fingerprint PAM sits armed for the entire lock waiting for a finger, so on any machine with a reader enrolled the gate is true from lock until unlock: the timer is stopped when the lock begins and never re-armed, and the display stays lit indefinitely. Gate on `authenticatingPassword` instead. A password check in flight still holds the display up, and the passive fingerprint wait no longer does. Claude-Session: https://claude.ai/code/session_01EDpyC9793TKZBS2jXUNECG Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>