Display power management policies in practice

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Scopus citations

Abstract

We 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, we also consider an alternative policy, user presence detection, that uses sonar sensing to power off the display when user absence is detected. Our study captures how these DPM policies work "in the wild", both in terms of energy savings and the user irritation. We also determine the maximum energy saving opportunity for any DPM policy, based on measured behavior. Our study, based on a 3,738 hours of computer usage by 181 volunteers with different machines, reveals several surprising results. User idle periods follow power law distributions with little temporal correlation. The maximum possible reduction in energy used for the display is 81%, while the HID timeout policy manages to reduce this energy by 51%. Many users have already customized the HID timeout policy on their machines, resulting in a high variation of timeout values, and surprisingly low levels of user irritation. However, the 44% of users that have not customized HID timeouts experience more irritation. The proposed user presence detection policy, when effective, further reduces display energy consumption by 10% when combined with the HID timeout policy. 40% of the 2,869 machines tested can effectively generate and record ultrasound for sonar.

Original languageEnglish (US)
Title of host publicationProceeding of the 7th International Conference on Autonomic Computing, ICAC '10 and Co-located Workshops
Pages51-60
Number of pages10
DOIs
StatePublished - Jul 23 2010
Event7th IEEE/ACM International Conference on Autonomic Computing and Communications, ICAC-2010 and Co-located Workshops - Washington, DC, United States
Duration: Jun 7 2010Jun 11 2010

Publication series

NameProceeding of the 7th International Conference on Autonomic Computing, ICAC '10 and Co-located Workshops

Other

Other7th IEEE/ACM International Conference on Autonomic Computing and Communications, ICAC-2010 and Co-located Workshops
CountryUnited States
CityWashington, DC
Period6/7/106/11/10

Keywords

  • attention
  • display power management
  • presence
  • sonar
  • ultrasound
  • user study

ASJC Scopus subject areas

  • Computational Theory and Mathematics
  • Computer Science Applications
  • Human-Computer Interaction
  • Software

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