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Windows 7: Strange Windows 7 beta power management issue...

07 Mar 2009   #1

Windows 7 beta
Strange Windows 7 beta power management issue...

I recently built a new computer (Intel mobo, Core 2 Duo quad-core, 4GB RAM) and installed the Windows 7 beta (32-bit).

One issue that I have observed seems to be related to power management. After about a half-hour of non-use, the computer seems to go into sleep mode. The screen shuts down, all the fans stop, and the hard drive and power lights go out. It then sits there for about a minute like this, and then, for no reason that I can see, it powers back up again. The fans rev up, the lights come on, the screen takes on a glow (though nothing is displayed), etc.

After a few minutes, it powers down again. After another minute, it powers back up. This cycle seems to go on indefinitely.

Does anone have any idea what might be causing this or what I might do to determine what the problem is? I have never seen anything like this before.


My System SpecsSystem Spec
07 Mar 2009   #2

Win7 Ultimate x64 on Desktop / Win7 Ultimate x86 on laptop / Win7 x86 Starter on Netbook

It could be one of your peripherals waking the computer from sleep.
Check the setting of anything you have that could wake the computer up!
My System SpecsSystem Spec
07 Mar 2009   #3

64-bit Windows 10 Pro

Hello Cab, and welcome to Seven Forums.

Double check the items listed in this tutorial to see it may help you determine what is waking up your computer.

Power Options and Sleep Mode Problems - Vista Forums

I would agree with Romulinx. It sounds like it may be something like your network adaptor is set to "Allow to wake computer" in the Power Management properties in Device Manager.

Hope this helps,
My System SpecsSystem Spec

07 Mar 2009   #4

Windows 7 beta

Thanks for the input. I will check for anything that might be waking the system up. I have a Windows Home Server on my network....I wonder if that might be the culprit.

If I figure it out I will post the solution. It might help others.

My System SpecsSystem Spec
08 Mar 2009   #5

Windows 7 beta

After doing a little research and testing, it turns out that I was able to solve the problem by allowing the "Only allow a magic packet to wake the computer" option on my network adapter (Intel 82566DC-2) from the hardware manager.

I hope that helps anyone else who might have the same issue.
My System SpecsSystem Spec
08 Mar 2009   #6

64-bit Windows 10 Pro


I'm happy to hear that you got it sorted. Thank you for sharing your results.
My System SpecsSystem Spec
09 Mar 2009   #7

Windows 10 Pro x64 x2 Windows 10 Enterprise x64, Ubuntu

Just as an additional option to help with diagnosing unexpected wakeup the powercfg - LASTWAKE command in a CMD prompt window, immediately after the wake will return the cause of the wake event.
My System SpecsSystem Spec

 Strange Windows 7 beta power management issue...

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