My workstation will not enter sleep, or will not enter the S3 sleep state.
Posted by 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.
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.
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:
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.
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:
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.
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.
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: