My workstation will not enter sleep, or will not enter the S3 sleep state.
Posted by , Last modified by Adam Zilliax on 08 March 2011 02:27 PM
The first step to troubleshooting any issue is to define the behavior that the computer is showing when it attempts to go to sleep. 

Does the computer only show this problem when the system is out to sleep with Power Save?

If so then the focus of troubleshooting will be on the settings in the Power Save product, we should verify the settings in place and find out if the software is properly configured to bring the computer into a sleep state when the customer is expecting it to.

Does the problem occur when the system is manually put to sleep?

If the problem occurs even when the system is manually put to sleep then the issue is likely due to some type of hardware / software issue that could be blocking the computer from entering a sleep state. At this time a deep dive through the BIOS and system settings will need to be done to determine if the issue can be resolved.

What is the problem?

If the computer does not properly enter a sleep state then the focus will need to be on finding the conditions that are causing the error to occur. 

If the computer is consuming too much power during the sleep state please check the following links:
hen testing a system with Power Save the system refuses to enter a S3 sleep state when the computer is configured to do so, the computer may ignore the request to sleep or may enter a S1 sleep state instead. This will generally only be shown when power consumption is being monitored via a Watt meter connected to the computer. The S1 sleep state will consume much more power than the S3 sleep state (50w vs. 5w as an example).


By default, Microsoft Windows XP and Microsoft Windows Server 2003 enable a universal serial bus (USB) keyboard and a USB mouse to wake a computer after the computer goes to sleep. Other types of USB devices can be enabled to wake the computer if you click to select the Allow this device to bring the computer out of standby check box. You can click to select this check box on the Power Management property page in Device Manager.

When a USB device is enabled to wake the computer, the default behavior permits the computer to enter the S1 system power state for standby. Standby is not the S3 system power state. The S1 system power state is a "lighter" system power state than S3. The S1 system power state typically conserves less power than the S3 system power state.
When Power Save is installed the software will by default enable the check box in the device manager allowing the keyboards and mice to bring the computer out of standby, in some systems where the vendor or the customer have not enabled the S3 sleep state this can cause a system that previously entered the S3 sleep state to enter S1 instead.


This issue has at this time only been noted on computers running Windows XP that have been upgraded from Windows 2000, and where not upgraded via a clean install of the operating system. It appears that most OEM's enable the S3 sleep state via the registry workaround at the end of this document.

Identifying problem Devices

To identify a problem device that is preventing a computer from entering S3 sleep the computer will need to be configured within Windows so that the operating system will see S3 as the minimum sleep state that it is allowed to enter into. This can be done using the DUMPPO.EXE application from the Microsoft Server 2003 Resource Kit and the command line listed below:

dumppo admin minsleep=S3

After running this command put the computer to sleep manually, if there is a device that is preventing S3 sleep an error will be displayed identifying the device driver by name.

There are a number of identified workarounds for this issue.

Via Device Manager

Disable the Allow this device to bring the computer out of standby check box for any device that is preventing the computer from entering the sleep state. This means that the device will no longer be able to wake up the computer when it is powered down. This is not suggested for keyboards and mice as most users will expect the computer to wake when those devices are used.

Via Registry Edit

This issue can also be resolved by editing the following registry key:


Editing this key will override the default behavior of the S3 sleep state in Windows XP and should allow the computer to enter S3 Sleep regardless of the devices attached. This fix is documented on the Microsoft site at the URL Below:
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