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Laptop turns itself on during the night

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Ok, what a strange problem I'm having here. I have a Dell Studio XPS 1640 and lately, its been turning itself back on!

The lid is closed, the power cord is disconnected and the system is in "Sleep". I'm running Windows 7.
Windows Update has no pending updates and is set to wake up and install only at 12:00 PM, so I know its not Windows Update.

I'll just wake up from a night sleep and find out my computer drained itself of battery. It's annoying.
Last night, it woke itself up at about 4 AM.

Take a look at the log (highlighted part is important?): http://pastebin.org/116385

It woke up at 4:56 this morning. Why does this happening?
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Neil Jones

Neil Jones

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Obviously can't sleep. *grin at cheesy attempt at humour*


Well line 127 seems to suggest that the power button has been pressed.
Serious question time: Do you have any pets in the house (a cat for example) with free roam and the ability to either walk across the laptop? Sometimes it may be possible for vibrations from any moving action to depress the button if it doesn't take much to get it started.

Alternatively a better idea may be to hibernate the system as opposed to putting it to sleep. In hibernation you can also take the battery out. Then if the laptop is running in the morning with no battery, you have a major issue.
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For those who cannot figure out what is causing the problem, they can force a sleep/wake solution.

Sleep-Wake Solution:

This is a solution for those who want their computers to never wake from sleep on their own and simpler solutions have not worked. Nothing other than tapping a button or opening the cover will wake it. Not the planned tasks which are scheduled to wake up your system such as Windows Media Center or the unknown causes. The only negative I’ve found is that a laptop will not wake to hibernate if the battery is getting too low. It will just go dead and any unsaved information will be lost.

1. Open a command-prompt and type the following lines of information. Press “enter” after each of the following.

2. powercfg -setacvalueindex scheme_current sub_sleep bd3b718a-0680-4d9d-8ab2-e1d2b4ac806d 0

3. powercfg -setdcvalueindex scheme_current sub_sleep bd3b718a-0680-4d9d-8ab2-e1d2b4ac806d 0

4. powercfg -setactive scheme_current

(there is a space after powercfg)

These can be copied and pasted into the command-prompt by clicking on the header/edit/paste at the top of the command-prompt window.

This changes the current power scheme defaults that stops the machine from being woken from sleep. It applies to the current power scheme on a computer, which was the "balanced' power scheme on my latest test. This solution has worked on both Win7 and Win8.

During my command-prompt test on a new Win8 system, it appears to have reset the power settings to default since things again have their default time-out settings after using the command-prompt solution. There have also not been any wakes reported during the test period in Event Viewer / system. I had rebooted the machine after entering the command-prompt solution, but I’m not sure if this was necessary or not after having entered step 4 into the command prompt.

I also reviewed the Event Viewer on two other systems, and there have not been any wakes on those systems since I implemented the command-prompt solution on them two weeks ago.

Important: The additional step of going to Control Panel / Power Options, and then resetting the current power scheme to the default values under advanced settings may also be necessary after implementing the config changes. The user can then readjust things back to their own preferences.

To revert things back to the way things were before the config changes, enter the same strings with a 1 at the end instead of the 0.

For those who like to know what is taking place, The above config changes apply to following registry keys:







The above has been tested to work in Win7 and Win8. It modified the SKUACSettingIndex to a 0 from a 1 in Win8 under all the above categories during the test, which could also be done manually through regedit as an alternative.

Edited by pkinslow, 12 February 2013 - 01:37 AM.

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