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Power Management

Power Management. Battery Saving States. Sleep or standby Display and hard disk turn off All programs and data are still in RAM Power needed to support RAM Take a little time to wake up Hibernation Everything (programs and data) are saved on the hard disk. Use much less power than Sleep

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Power Management

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  1. Power Management

  2. Battery Saving States • Sleep or standby • Display and hard disk turn off • All programs and data are still in RAM • Power needed to support RAM • Take a little time to wake up • Hibernation • Everything (programs and data) are saved on the hard disk. • Use much less power than Sleep • Take longer to wake up than Sleep • Power Off • Everything is saved, provided it was shut down properly • The computer does not use any power • Take longest to wake up (boot up)

  3. Power-saving tips • Turn display brightness to the lowest comfortable level • Turn off wireless(WIFI) if not needed • Turn off Bluetooth if not needed • Take CD/DVD out • Stop programs that are not being used • Turn off keyboard backlight or low • Keep the laptop cool

  4. Power Management Settings • Mac • On Battery or On Power Adapter • Computer sleep • Display sleep • Hard disk to sleep when possible • Dim display • Auto reduce brightness

  5. Power Management • PC • Balanced (on battery or plugged in) • Dim display • Turn off display • Put computer to sleep • Adjust display brightness • Power Saver • Dim display • Turn off display • Put computer to sleep • Adjust display brightness

  6. Advanced Power Options for PC • Power buttons and lid • Lid close action: • On battery: do nothing/sleep/hibernate/shutdown • Plugged in: do nothing/sleep/hibernate/shutdown • Display • Dim display after: • On battery: # minutes • Plugged in: # minutes • Turn off display after • On battery: # minutes • Plugged In: # minutes

  7. Advanced Power Options for PC • Battery • Critical battery action • On battery: sleep/hibernate/shutdown • Plugged in: Do nothing/sleep/hibernate/shutdown • Critical battery level • On battery: 5% • Plugged in: 5% • Processor power management • System cooling policy • On battery: passive • Plugged in: passive

  8. Extend Battery Life • Keep battery contacts clean • Completely charge it the first time • Charge battery correctly • Nickel-based (NiMH): • completely drain it and recharge it • how often? read the owner’s manual • Lithium Ion: • Don’t plug in all the time • Can be partially discharged and recharged • NEVER fully discharge it • Keep 50% for long-term storage • Discharge/recharge at least once per month

  9. References • http://www.microsoft.com/atwork/maintenance/battery.aspx • http://www.apple.com/batteries/notebooks.html • http://support.apple.com/kb/ht1446

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