Microsoft KB Archive/247020

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Disabling and Re-enabling APM Alters Power Schemes Timeouts

Article ID: 247020

Article Last Modified on 11/1/2006



APPLIES TO

  • Microsoft Windows 2000 Professional Edition



This article was previously published under Q247020

SYMPTOMS

When you disable and then enable advanced power management (APM) on a computer running Microsoft Windows 2000 Professional, the power schemes change. The changes affect the automatic standby and hibernation timeout options and can cause battery power loss.

STATUS

Microsoft has confirmed that this is a problem in Microsoft Windows 2000 Professional.

MORE INFORMATION

The following tables show what the power scheme settings are when you disable or enable APM. Use the appropriate set of steps to view the changes.

To view power scheme changes on a computer that has the APM auto-enable feature:

  1. Install Windows 2000.
  2. In Control Panel, double-click Power Options and then view the power scheme, noting the settings.
  3. Disable APM.
  4. Restart the computer.
  5. Enable APM.
  6. View the power scheme again to see the changes.

Starting Behavior for the Portable/Laptop Scheme

  Plugged In Running on Batteries
Monitor After 15 Min. After 5 Min.
Hard Disks After 30 Min. After 5 Min.
Standby After 20 Min. After 5 Min.
Hibernation After 1 Hr. After 10 Min.


Behavior After Disabling the Portable/Laptop Scheme

  Plugged In
Monitor: After 15 Min.
Hard Disk: After 30 Min.


Behavior After Enabling APM Again

  Plugged In Running on Batteries
Monitor After 15 Min. After 5 Min.
Hard Disks After 30 Min. After 5 Min.
Standby Never Never
Hibernation BLANK After 5 Min.


To view power scheme changes on a computer that supports APM but is not auto-enabled:

  1. Install Windows 2000.
  2. In Control Panel, double-click Power Options, and then view the power scheme, noting the settings.
  3. Enable APM.
  4. View the power scheme and note the changes.
  5. Disable APM.
  6. Restart the computer.
  7. Enable APM.
  8. View the power scheme to see the changes.

Starting Behavior for the Home/Office Desk Scheme

  Plugged In
Monitor: After 20 Min.
Hard Disk: Never


Behavior After Enabling APM and Hibernation

  Plugged In Running on Batteries
Monitor: After 20 Min. After 5 Min.
Hard Disk: Never After 10 Min.
Standby: Never Never
Hibernation: Never After 15 Min.


Behavior After Disabling the Home/Office Desk Scheme

  Plugged In
Monitor: After 20 Min.
Hard Disk: Never


Behavior After Enabling APM Again

  Plugged In Running on Batteries
Monitor: After 20 Min. After 5 Min.
Hard Disk: Never After 10 Min.
Standby: Never Never
Hibernation: Never Never



Additional query words: standby

Keywords: kbbug kbnofix KB247020