Windows – Why does the Windows computer immediately turn back on after sleep/hibernate

hibernatesleepwindows 7

After clicking sleep or hibernate in Windows 7, my computer loads for a while and then goes into sleep mode, but not 1 second later it powers back up. The event log has no errors and no warnings appear when it comes back out of sleep/hibernation.

Here's my system specifications:

I believe this is all that's relevant. I've installed the latest chipset drivers, but I'm unable to update my BIOS (but this is another matter; maybe because the motherboard in the V3-P5G31 bundle is different).

I've also tried turning off the "Allow this device to wake up my computer" for the network card, keyboard, and mouse — but this makes no difference.

If flashing the BIOS is the only thing that will fix this, then I will create a new question to this effect.

Maybe I should change the suspend mode from S3 to S1?

Best Answer

To continue from Nicholaz's answer this reveals some wake events in the event log that I missed out, since they were not errors:

To find out what caused your computer to wake from sleep, do the following:

Open Event Viewer by clicking the Start button , clicking Control Panel, clicking System and Maintenance, clicking Administrative Tools, and then double-clicking Event Viewer.‌ If you are prompted for an administrator password or confirmation, type the password or provide confirmation.

  1. Expand Windows Logs, and then click System.

  2. In the Actions pane, click Filter Current Log.

  3. In the Filter Current Log dialog box, in the Logged list, select the time range.

  4. In the Event sources list, select Power-Troubleshooter, and then click OK.

  5. In Event Viewer, in the System pane, select the date and time for the event that you want to view.

  6. On the General tab, view the Wake Source for the event.

After inspecting the filtered results, I see plenty of messages like so:

The system has resumed from sleep.

Sleep Time: ‎2010‎-‎02‎-‎24T23:42:44.283678200Z
Wake Time: ‎2010‎-‎02‎-‎24T23:43:10.233041900Z

Wake Source: Device -USB Root Hub

However, I've also spotted this rather annoying "unknown source" variant:

The system has resumed from sleep.

Sleep Time: ‎2010‎-‎02‎-‎20T22:41:30.687040200Z
Wake Time: ‎2010‎-‎02‎-‎21T10:07:54.488171000Z

Wake Source: Unknown

I will update my answer if the solution is disallowing this device to wake the computer.

Update:

I have resolved my issue!

Turns out that the "USB Root Hub" source is a little misleading; it was actually both my keyboard and mouse that were waking up my computer (without being touched/pressed). The solution was to uncheck "Allow this device to wake up the computer" on both the mouse and keyboard devices (selecting them independently does not resolve the issue).

Perhaps updating my mouse/keyboard drivers will fully resolve the issue.

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