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My new Windows 7 64bit laptop keeps waking up from sleep. I tried various things and still it wakes up:

  • Disconnecting the mouse\keyboard
  • Disconnecting it from the LAN
  • Keeping it with the lid closed

How can I find the reason for its wakeup?

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1  
Do you possibly have WiFi or a 3G card on the machine? That's usually what does it. –  user3463 Oct 10 '10 at 18:26

3 Answers 3

Is your network card allowed to wake the computer?

  1. Open Device Manager
  2. Open Network Adapters and navigate to your network card.
  3. Right click on the network card and select properties.
  4. Go to the Power Management tab and untick the option to prevent your network card from waking up Windows.

A few commands to see what the last wakeup events were, and which device caused it:

powercfg -lastwake
powercfg -devicequery wake_armed

Also check in Control Panel:

  • Power Settings, Change Plan Settings, Change Advanced Power Settings

... walk the list there and see if anything looks promising.

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  • Take a look at the Event Log
  • Check if there are scheduled tasks
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This comment is in regards to NEWER laptops.

IF it wakes up and stays awake, disregard this comment ...

Else, it is most likely attempting to keep your 'apps' updated using Intel's new Smart Connect Technology.

How it works:

"While your computer is asleep, Intel Smart Connect Technology wakes the system periodically and re-establishes network connectivity. This enables your applications that receive data from the Internet ... to quickly sync with the cloud service and update your system. After the content is updated, the system automatically transitions back to sleep mode."

Link: http://www.intel.com/content/www/us/en/architecture-and-technology/smart-connect-technology.html

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