Display Power Management Policies in Practice

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Executive Summary

The authors present the first study of the real-world behavior of Display Power Management (DPM) policies. DPM policies control the mechanism of powering on and off the display - turning off the display typically reduces total system power by ~31%. The most widely used DPM policy, Human Interface Device (HID) timeout, powers off the display after a user-configurable period of human interface device inactivity, and powers it back on in response to activity. To increase energy savings, the authors also consider an alternative policy, user presence detection, that uses sonar sensing to power off the display when user absence is detected.

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