When I put my PC to "sleep" it will randomly wake up, after awhile go back to sleep, repeat. Why is this?

Hi,

 

Do you have a USB Keyboard or Mouse?

It is possible that you have a internal device running off an internal USB connection as well....

 

You might try going to Advanced Power Options and disabling "Allow Wake Timers" and see it it helps.

 

Also, check your BIOS for options that may wake your machine...my motherboard has multiple.

 

Try searching through your registry for the "4&51ffa7f&0" vcalue and see if anything comes up.

I do not have a USB Mouse or keyboard. The computer this is occurring on is an Alienware laptop when I'm hitting the "FN + F1" button combination on the internal keyboard. I stumbled across this post(http://support.microsoft.com/kb/972664?wa=wsignin1.0) that seems to echo your thoughts, though it doesn't really propose a solution regarding their first workaround, since the keyboard this issue is occurring on is an internal keyboard.

Wake timers have been disabled since this issue started. Searching the registry for that value yields a registry entry under HKLM\System\ControlSet001\Controll\DeviceClasses{f18a0e88-c30c-11d0-8815-00a0c906bed8}. In this entry, there are folders with 2 USB Root Hubs, one listed as "##?#USB#ROOT_HUB20#4&51ffa7f&0#{f18a0e88-c30c-11d0-8815-00a0c906bed8}". In this are two registry values as follows:

1. (Default)              REG_SZ      (value not set)
2. DeviceInstance    REG_SZ      (USB\ROOT_HUB20\4&51ffa7f&0)

I'll double-check my BIOS and get back to you, but I don't remember any keyboard settings in my BIOS. Dell locked down a number more advanced features that you get on custom-built systems. UPDATE: Checked my BIOS and Allow USB To Wake Device is also disabled.

Hi,

Do you have a USB Keyboard or Mouse?

It is possible that you have a internal device running off an internal USB connection as well....

You might try going to Advanced Power Options and disabling "Allow Wake Timers" and see it it helps.

Also, check your BIOS for options that may wake your machine...my motherboard has multiple.

Try searching through your registry for the "4&51ffa7f&0" vcalue and see if anything comes up.

Hi,

 

You could take a look at this link and see if it has any useful tips...

 

http://www.cravingtech.com/fix-windows-vista7-sleep-mode-from-waking-up-by-itself.html

SLance,

This was a great tip. I was able to determine that (for at least one event) the cause of my computer randomly waking was the USB Root Hub. This doesn't really help matters, because I've got nothing plugged into any of the USB ports. I've already gone through the device manager and checked to make sure that any of the USB hubs or controllers listed do not have the ability to wake my computer from sleep. Any suggestions from here? The wake report is below.

Wake History Count - 1

Wake History [0]

  Wake Source Count - 1

  Wake Source [0]

    Type: Device

    Instance Path: USB\ROOT_HUB20\4&51ffa7f&0

    Friendly Name:

    Description: USB Root Hub

    Manufacturer: (Standard USB Host Controller)

Hi,

You could take a look at this link and see if it has any useful tips...

http://www.cravingtech.com/fix-windows-vista7-sleep-mode-from-waking-up-by-itself.html

No, I do not. I'm not clear on what could be causing these sleep issues. Putting my computer to sleep also seems to be an issue. I'm afraid I may have to do a clean install.

Bill