Herbie Murray
If your Windows or Mac computer is waking up from sleep mode, there are several ways to find out what's causing it. One way is to use the Command Prompt or PowerShell by typing powercfg lastwake or powercfg –waketimers to see the device that woke your computer. You can also use the Event Viewer by going to Windows Logs > System and finding the Power – Troubleshooter option. From there, you can see what woke up your computer in the Wake Source tab, as well as other information like Sleep Time and Wake Time. Another method is to open the Start menu, search for Device Manager, and find the Ethernet or Wi-Fi adapter in question under Network Adapters. Right-click, choose Properties, and open the Power Management tab. Here, you can uncheck the Allow This Device to Wake the Computer option. Additionally, you can modify power settings, enable hibernation, and ensure that your keyboard and mouse can wake up your computer.
| Characteristics | Values |
|---|---|
| How to find the program that wakes a sleeping computer | Use the POWERCFG command on Windows Terminal |
| How to use the POWERCFG command | Right-click on the Start Menu, select Windows Terminal (Admin), type or copy and paste the command and press Enter |
| What the POWERCFG command does | Displays the reason for the PC waking from sleep mode |
| How to use the Event Viewer app | Type Event Viewer into the Windows search bar and click on the result, double-click on Windows Logs, click on System |
| How to use the Command Prompt or PowerShell | Type powercfg lastwake into the Command Prompt or PowerShell |
| How to use the Event Viewer with the Windows Key | Press the Windows Key + R, type in eventvwr.msc and press Enter, expand Windows Logs, right-click on System, and click on Filter Current Log |
| How to stop the computer from waking up | Uncheck the "Allow This Device to Wake the Computer" option in the Power Management tab |
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What You'll Learn
Check the BIOS settings
To check the BIOS settings on your computer, you will first need to enter the BIOS setup. This can be done by pressing a specific key when your computer first boots up. Common keys used to enter the BIOS setup include Delete and F2, but the boot screen should tell you which key to press.
Once you have entered the BIOS setup, you can check the BIOS settings to see if any devices are allowed to wake the computer. These settings can usually be found under Power Management or Network Adapters. Look for options such as Allow This Device to Wake the Computer or USB Wake. If you find that a device is allowed to wake the computer, you can disable this setting.
In addition to device settings, you may also find network wake-up options in the BIOS. These options may include settings such as Allow a Magic Packet to Wake the Computer, which can be useful if you use Wake-on-LAN to access your computer remotely.
It is important to note that the BIOS settings may vary depending on your computer's specific hardware and software configuration. If you cannot find the relevant settings in the BIOS, you may need to refer to your computer's documentation or seek additional technical support.
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Use the POWERCFG command
If your Windows computer keeps waking up from sleep mode, you can use the POWERCFG command on Windows Terminal to find out what's causing this.
First, right-click on the Start Menu and select Windows Terminal (Admin). In the Terminal, type or copy and paste the following command and press Enter:
Powercfg –lastwake
This will display the reason for your PC waking from sleep mode, including the sleep time, wake time, and wake source details. For example, it might be a specific program like File Explorer, or a device like your keyboard.
You can also use the following command to find out what woke your computer:
Powercfg –waketimers
This will show you a list of active wake timers, which are scheduled events that are allowed to wake your machine.
Another variation of the POWERCFG command is:
Powercfg/energy
This will tell Windows to observe its power plans and generate a report for you to review. Once it's done, Command Prompt will tell you the path to the report, which you can then open and review. Look for anything that says, "The program has made a request to prevent the system from automatically entering sleep." That's the program keeping your computer awake.
You can then check that program's settings to see if you can allow the computer to sleep or, if necessary, uninstall the program.
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Check the Device Manager
If your computer is waking up from sleep mode unexpectedly, it's likely that a device or program is waking it up. To find the culprit, you can check the Device Manager in Windows.
Here's a step-by-step guide on how to do this:
Open the Device Manager: Right-click on the Start menu or press Windows key + X
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Check the Command Prompt
If your Windows computer is waking up from sleep mode on its own, you can use the Command Prompt to find out which device or process is causing this.
First, open the Start menu and search for "cmd". Right-click on the Command Prompt listing and select "Run as Administrator". You can also use the shortcut Win + R to open the Run dialog, then type "cmd" in the box and press Ctrl + Shift + Enter to launch Command Prompt with admin rights.
Once the Command Prompt is open, type in the following command and press Enter: "powercfg -lastwake" or "powercfg -waketimers". This will show you the device that woke your computer. It is often a USB device or a wireless device, but it could be anything. If you see "Wake History Count - 0", it means that Windows doesn't have a record of wake history, which can happen if you've recently rebooted your computer.
If you want to see a list of all the devices that are allowed to wake your computer from sleep mode, you can use the following command: "powercfg -devicequery wake_armed". This will show you a list of devices that can wake your computer, such as your keyboard, mouse, or network adapter.
In addition to checking the Command Prompt, you can also use the Event Viewer to find more details about what woke your computer. Press the Windows Key + R, type in "eventvwr.msc", and press Enter. Expand "Windows Logs", right-click on "System", and click on "Filter Current Log". Expand "Event sources" and click on "Power-Troubleshooter". This will show you information about whether a scheduled task or a network event woke your computer.
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Check the Event Viewer
If you want to find out what program is waking your Windows PC from sleep mode, you can use the Event Viewer app. Here's how to do it:
First, open the Event Viewer. You can do this by searching for "Event Viewer" in the Windows search bar and clicking on the result to open it.
Next, navigate to the correct logs. In the left pane of the Event Viewer, double-click on "Windows Logs" and then click on "System".
Now, you need to filter the logs to find the relevant information. Right-click or press and hold on "System" and select "Filter Current Log". In the Event sources menu, check "Kernel-Power" and "Power-Troubleshooter". Make sure to check all the Event Levels.
Finally, you can view the wake source information. Click on an event log in the middle pane of the Event Viewer to see the wake source. For example, Kernel-Power logs with Event ID 507 can indicate that a Modern Standby device woke your computer from Connected Standby.
By following these steps, you can use the Event Viewer to find out which program or device is waking your Windows PC from sleep mode.
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Frequently asked questions
To find out what woke your computer from sleep mode, you can use the Command Prompt or PowerShell. Type "powercfg lastwake" into the Command Prompt or PowerShell and press enter. This will show you the device that woke your computer.
You can also use the Event Viewer. Go to Windows Logs > System. Scroll down to find the Power – Troubleshooter option and click it to open it. In the General tab, you can see what woke up your computer in the Wake Source.
Once you know which device is waking up your computer, open the Start menu and search for "Device Manager". Find the device in the resulting list, right-click on it, and select "Properties". Click on the Power Management tab and uncheck the "Allow This Device to Wake the Computer" option.
You can also try entering the BIOS and disabling USB waking from there. Press a key when your computer first boots, usually something like Delete or F2—the boot screen will tell you.
Network connections, scheduled tasks, and background wake timers can also wake your computer from sleep mode.
