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  • Sonar Software Detects Laptop User Presence
    By on October 16, 2009 | Comments Off  Comments

    Steve Tarzia writes “A research group at Northwestern University and University of Michigan has released open-source display power-management software that uses a new user presence detection technique. The goal is to shut off the display immediately when the user leaves the computer rather than using slow and error-prone mouse/keyboard activity timeouts. Surprisingly, the mic and speakers of many laptop computers are sensitive to ultrasonic frequencies. (more…)