Lastwake Command

How to See What Woke Up Your Computer Last​

   Information

This will show you how to see what device, task, or etc... has woken up your computer from sleep or hibernation last in Vista, Windows 7, and Windows 8.

This will work best if you do this right after your computer wakes up, and before the next time is sleeps. Otherwise you may miss what last woke it previously.

OPTION ONE

Using the "lastwake" Command

1. Open a command prompt in Vista, Windows 7, or Windows 8.

2. In the command prompt, copy and paste the command below and press enter. (see screenshot below step 3)
powercfg lastwake
3. You will now see what last woke up your computer. (see screenshot below)


For example:
This is what last woke up my computer from above. Just for information purposes, you can look this up in Device Manager (devmgmt.msc).
HID=Human Interface Device

• Description - HID-compliant Bluetooth Mouse

• Instance Path - HID\VID_046D&PID_C71C&REV_0101&Col01

4. See related links below if you wish to not allow this device or item to wake the computer anymore.

OPTION TWO

Reading the "Wake Source" Event Viewer Log

1. For how, see: How to Read the Wake Source Log in Event Viewer for Vista, Windows 7, and Windows 8
That's it,
Shawn

Related Tutorials

---

• How to Read the Wake Source Log in Event Viewer for Vista, Windows 7, and Windows 8
• How to Enable or Disable Windows Media Center Updates to Wake Up the Computer
• How to See a List of Devices that are able to Wake Up the Computer
• How to Allow or Prevent Devices to Wake Up Computer
• How to See Available Sleep States on Your System in Windows 7
• How to See Available Sleep States on Your Windows 8 PC
• How to See the Last Shutdown Time of Your Windows PC​
• How to Change the Return to Sleep Timeout for a Unattended Wake Up in Windows​
• How to View and Override Power Availability Requests in Windows​
• How to Add or Remove "Allow wake timers" in Power Options in Windows​

 

[tanitani]

Thank you. The powercfg -lastwake command is not working as you described. The following is the result of running it every time the laptop woke up. The first one was a spontaneous wake the rest were by opening the display, NOT a BUTTON!
Thanks.
Gábor

Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.

C:\Windows\system32>powercfg -lastwake
Wake History Count - 1
Wake History [0]
Wake Source Count - 0

C:\Windows\system32>powercfg -lastwake
Wake History Count - 1
Wake History [0]
Wake Source Count - 1
Wake Source [0]
Type: Fixed Feature
Power Button

C:\Windows\system32>powercfg -lastwake
Wake History Count - 1
Wake History [0]
Wake Source Count - 1
Wake Source [0]
Type: Fixed Feature
Power Button

C:\Windows\system32>powercfg -lastwake
Wake History Count - 1
Wake History [0]
Wake Source Count - 1
Wake Source [0]
Type: Fixed Feature
Power Button

C:\Windows\system32>powercfg -lastwake
Wake History Count - 1
Wake History [0]
Wake Source Count - 1
Wake Source [0]
Type: Fixed Feature
Power Button

C:\Windows\system32>powercfg -lastwake
Wake History Count - 1
Wake History [0]
Wake Source Count - 1
Wake Source [0]
Type: Fixed Feature
Power Button

 

[Brink]

Hello Gábor, and welcome to Seven Forums.

"Power Button" may just be a general term used for whatever action "opening the display" you did to wake the computer.

You might also check the items listed in this tutorial to see if it may help determine what woke up your computer as well.

Power Options and Sleep Mode Problems - Vista Forums

 

[tanitani]

Hello Brink,

Thank you for the quick reply. And thank you for the welcome as well.
I followed your tutorial, and after checking everything the only setting that was different was the:

PCI Express -> Link State Power Management -> Off

For me it was "On". I made the change and so far (about a week) it seems that it works: the laptop did not wake on its own.

The "opening the display" just meant that I opened the screen/lid/display of my laptop up.
Which should not happen actually, since I set the action for "When I close the lid" as "Do nothing".
On all the other laptops I worked with this setting allowed me to also open the laptop without it turning on, but this is a bit off topic.

Thanks again and now that the world did not come to an end (May 21 was supposed to be the end of the world, later it was rescheduled to be October 21 and May 21 was to be the date of "Rapture") I wish you have a good day!

Gábor

 

[Brink]

Hello Gábor,

That's great news. I'm happy to hear that you got it sorted. Thank you for posting back with your results.

Next it will be for Halloween night.

 

[Pixel Eater]

So what exactly does "Wake Source Count - 0" tell us? Because something is waking my computer up, but all I see is...

Wake History Count - 1
Wake History [0]
Wake Source Count - 0

This helped me fix a classic wake on Ethernet problem before, but now I'm not sure.

 

[Brink]

Hello Pixel Eater,

That indicates it doesn't have a wake source and a reason why.

If you haven't already, give OPTION TWO a try to see if Event Viewer may have a log of what woke the computer up.

Hope this helps for now.

 

[hansa1]

This has been a great help in determining what is waking my computer every hour. Thanks

BTW,

For example:
This is what last woke up my computer from above. Just for information purposes, you can look this up in Device Manager (devmgmt.msc).
HID=Harware ID

• Description - HID-compliant Bluetooth Mouse

I believe that in this case "HID" refers to "Human Interface Device".

 

[ColFrogfoot]

Hi I have tried command prompt and gotten
Wake History Count - 1
Wake History [0]
Wake Source Count - 0

I tried option 2 and got
Sleep Time: ‎2015‎-‎07‎-‎09T13:31:38.329965500Z
Wake Time: ‎2015‎-‎07‎-‎09T13:46:45.997946700Z

Wake Source: Unknown

I cannot stop it from waking up

 

[Brink]

Hello ColFrogfoot, and welcome to Seven Forums.

In addition, check your wake source log to see if it may reveal a culprit.

http://www.sevenforums.com/tutorials/179257-wake-source-read-event-viewer-log.html

 

[ColFrogfoot]

Thats what I just tried I got this I said
Sleep Time: ‎2015‎-‎07‎-‎09T13:31:38.329965500Z
Wake Time: ‎2015‎-‎07‎-‎09T13:46:45.997946700Z

Wake Source: Unknown

Also I just noticed this is windows 7 forums, Im on windows 8 :/

 

[Brink]

That's ok. This is the same in Windows 8 as well.

In that case, check to see what devices are allowed to wake the PC, and troubleshoot by disabling them one at a time from being able to wake up the PC and test to see if the PC still wakes up afterwards. Usually, it's the network adapter at fault.

http://www.sevenforums.com/tutorials/122019-devices-see-devices-able-wake-up-computer.html

http://www.sevenforums.com/tutorials/122027-devices-allow-prevent-wake-up-computer.html

 

[ColFrogfoot]

powercfg -devicequery wake_armed

NONE

(Ive turned everything off previously)

 

[ColFrogfoot]

Also I should note this is a new computer that I just got and its had this problem from the start. So I'm thinking it might be a manufacturing error? I dont know

 

[Brink]

To troubleshoot, disconnect anything that you have connected to the PC and put it to sleep to see if it still wakes up. If not, connect each device one at a time testing in between to see if the PC wakes with it connected until hopefully a culprit is revealed.

 

[ColFrogfoot]

Alright I will but excuse me for an hour I'm in class but I'll try that right as I get back

 

[Brink]

Ok. I'll be here when ready.

 

[ColFrogfoot]

Hey just posting an update. I unplugged everything and it didn't wake from sleep for about 40 minutes then I plugged everything in slowly over spans of about 20-30min and it wasn't waking still. So I turned it off and on again and soon after with everything plugged in it turned on again. So now I'll unplug one at a time again. This time I have classes for about 3 hours again but before I left for classes I unplugged the Ethernet cord because that's what I think might be the problem. So when I get back I'll see if it came off of sleep mode and let u know. By the way, thanks a lot for all this help

 

[Brink]

Great news so far. Now it's just a process of elimination matter.

 

[ColFrogfoot]

Hey so I got back from class and it was not on. So I'm going to be inclined to say right now that it is my Ethernet cord that is somehow causing the problem.