Troubleshoot problems with entering sleep mode

Power Management have been around since the first laptop was released to the main stream. For some strange reason power management have always had a lot of child diceases (crashes, slow-downs or just not saving power).

There are different commands available to diagnose power management issues:
  • What devices can wake the computer from sleep mode:

    powercfg -devicequery wake_from_any

  • What devices can wake the computer from standby:

    powercfg -devicequery wake_armed

  • Disable a device ability to wake the computer:

    powercfg -devicedisablewake "device name"

  • Make a device able to wake the computer:

    powercfg -deviceenablewake "device name"

New Vista Commands
  • What device caused computer to wake from sleep mode:

    powercfg -lastwake

More Info MS Technet - Powercfg Command-Line Options
New Windows 7 Commands
Windows 7 introduces some new commands, and if installing Win7 on a laptop, then one should try out the following commands:
  • Analyze the power comsumption of the computer, and lists devices with issues:

    powercfg -energy

  • Diagnose why the computer is not able to enter sleep mode:

    powercfg -requests

More Info MS KB976877

Credits The Old New Thing

Leave a Reply

Your email address will not be published. Required fields are marked *