SXPS 1645 unexpectedly wakes up from Sleep or Hibernation in Windows 7

For the last several days my Dell SXPS 1645 laptop running Windows 7 Professional randomly wakes up from either Sleep mode or Hibernation mode at any time during the day. The most it seems to stay off is for ~6 hours. It does not happen when I properly shutdown the PC. I checked the task scheduler, and nothing is scheduled to run at most of the times it wakes up, and none of the tasks are set to wake up the PC if scheduled to run. In the system logs, Windows 7 recognizes that it was waked up, but the "Power-Troubleshooter" event entry looks like this:

The system has resumed from sleep.

Sleep Time: ‎2010‎-‎01‎-‎18T11:10:00.659235300Z
Wake Time: ‎2010‎-‎01‎-‎18T17:43:26.545117000Z

Wake Source: Unknown

Any idea what could be causing this? I'm positive it's not a "Wake-on-LAN" feature as that's fully disabled and I'm only using WiFi anyways. I'm not sure if this happens when the laptop is only plugged in or if it happens on battery as well. (I'm continuing to see if there's a trend on this one)

Some background info: I'm running the original Dell build on the laptop with some of the bloatware removed via Control Panel. I've modded the ATI driver to the latest Catalyst version, which does seem to record the odd event error shortly after power-on (I noticed it when checking the power on event logs)... not sure if that's related.

I also posted this on the Microsoft Win7 forum... If I get a solution, I'll make sure to post it here.

Thanks in advance!

 

I'm glad to know I'm not the only one having this problem. One thing I tried was going into the power plan advanced settings>Sleep and disabling wake timers. I have no idea if this fixes it or not as I only tried it yesterday.

 

do a "powercfg -lastwake" from a command line. It will tell you what is waking the computer.

on mine, it was a stupid windows media centre task that was scheduled to run.

C:\Users\bgates>powercfg -lastwake
Wake History Count - 1
Wake History [0]
Wake Source Count - 1
Wake Source [0]
Type: Wake Timer
Owner: [PROCESS] \Device\HarddiskVolume3\Windows\System32\services.exe
Owner Supplied Reason: Windows will execute '\Microsoft\Windows\Media Center
\mcupdate_scheduled' scheduled task that requested waking the computer.



if you do a "powercfg devicequery wake_armed" you can also view hardware that has the ability to wake your machine. then you can go into device manager, power settings for each and disable 'can wake computer'

 

Ha! Glad I'm not alone. Good find on the power plan advanced settings! I've also set this. I'll see tonight if this has any impact.

I don't get any results for the first command at this time as I've rebooted since my last forced wake (trying to troubleshoot and such)... but I'll look for that the next time it happens. As for the device query, the only ones I get returns on are:

Code:

C:\Users\Paul>powercfg devicequery wake_armed
Logitech HID-compliant Unifying mouse
HID Keyboard Device
HID-compliant mouse (001)

Which makes a lot of sense, as you usually want to be able to wake up from Sleep taping the keyboard or moving the mouse. Right?

 

windows update, antivirus scans, and other things can wake this hardware up if they're scheduled.

 

Sweet! Looks like it's fixed! After disabling the advanced power settings as noted by Fenikkusu, the computer was out for almost 24 complete hours before I forced it come back!

I checked the event log in windows, as I had noticed that the PC was hibernated, versus sleeping which I believe I left it from the night before. Turns out after several hours off being in sleep, Windows 7 decided it should hibernate instead. It recorded this in the system log:

The system has resumed from sleep.

Sleep Time: ‎2010‎-‎01‎-‎19T22:10:16.307121700Z
Wake Time: ‎2010‎-‎01‎-‎19T22:10:12.456901500Z

Wake Source: S4 Doze to Hibernate

The event took only 17 seconds to record that the system needs to come up to the time that it blacked out from hibernation. I think I like this feature, and it makes a ton of sense! It decided to hibernate at exactly the 18 hour mark in its sleep state!

Overall, very happy with this solution. Rep Plus!

 

Glad it worked