Herbie Murray
If your computer keeps waking up from sleep mode, there are several ways to identify the source of the issue. You can use the Command Prompt or Windows PowerShell to determine which devices can wake your computer from sleep mode. Additionally, Windows offers a Wake-on-Lan feature that allows some network devices to wake up your PC remotely. You can also use the powercfg tool to control power states and analyse the system for energy efficiency and battery-life problems. If you want to prevent certain devices from waking your computer, you can configure their power management settings accordingly.
How to check for what devices wake from sleep mode
| Characteristics | Values |
|---|---|
| Operating System | Windows, Mac |
| Devices | Mouse, Keyboard, Power Button |
| Commands | powercfg -devicequery wake_armed, powercfg -devicequery wake_from_any, powercfg -devicequery wake_from_S1_supported, powercfg -devicequery wake_from_S2_supported, powercfg -devicequery wake_from_S3_supported, powercfg –lastwake, powercfg –waketimers |
| Other Methods | Windows Event Viewer, Device Manager, Windows Terminal, Command Prompt, Windows PowerShell, BIOS, Wake-on-Lan |
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What You'll Learn
Using the POWERCFG command on Windows Terminal
To check which devices can wake your Windows PC from sleep mode, you can use the POWERCFG command on Windows Terminal. This is a command-line utility that can control the power states of individual devices and analyse the system for common energy efficiency and battery-life problems.
To get started, 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 command will display the reason your PC woke from sleep mode. For example, it might be a specific program like File Explorer, or a device such as a mouse or keyboard.
You can also use the POWERCFG command to find out which devices can wake your system. To do this, open the Start Menu and search for Command Prompt. Right-click the top result and select 'Run as administrator'. Then, type the following command and press Enter:
> powercfg /waketimers
This command will show you the active wake timers on Windows. You can also use the following command to view app and driver power requests:
> powercfg /requests
After completing these steps, you will have a better understanding of the devices, apps, and drivers that can actively wake your system from sleep or hibernation.
Additionally, you can use the POWERCFG command to enable or disable a device's ability to wake your system automatically. This is particularly useful if your computer wakes up at night without any explanation. To do this, use the following command to review devices that are not currently set to wake your computer:
> powercfg /devicequery wake_programmable
Then, use the following command to enable a specific device to wake the system:
> powercfg /deviceenableawake "DEVICE-NAME"
Replace "DEVICE-NAME" with the name of the device you want to enable. For example:
> powercfg /deviceenablewake "Intel(R) 82574L Gigabit Network Connection"
Finally, you can confirm that the device has been enabled by using the following command:
> powercfg /devicequery wake_armed
Confirm that the device name appears in the list.
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Using the Event Viewer app
To check which devices are waking your Windows PC from sleep mode, you can use the Event Viewer app. Here's how:
First, open the Event Viewer app by typing "Event Viewer" into the Windows search bar and clicking on the result. This will open the Event Viewer window.
Next, in the left pane of the Event Viewer, locate and click on "Windows Logs". From the options that appear, click on "System".
Now, in the middle pane of the Event Viewer, you will see a list of event logs. Each log contains details about a specific event, including the time and source of the event. To find out which device woke your PC from sleep mode, you need to look for an event log with "Kernel-Power" or "Power-Troubleshooter" in the "Event Source" column.
Once you've found the relevant event log, double-click on it to view the details. In the "General" tab, you will see information such as the date and time of the event, as well as a description of the event. In the "Details" tab, you can find more specific information about the event, including any devices or applications involved.
Additionally, you can use the Filter Current Log option in the right-click menu to narrow down the list of event logs. This allows you to specify a time range or other criteria to find the event log you're looking for more easily.
By using the Event Viewer app and following these steps, you can identify which device or application woke your Windows PC from sleep mode and take any necessary steps to prevent it from happening again if needed.
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Using the powercfg tool
The powercfg tool is a command-line utility that can be used to control the power states of individual devices and analyze the system for common energy efficiency and battery-life problems. It can be used to identify which devices are waking your Windows computer from sleep or hibernation, and to disable them if needed.
To use the powercfg tool, open the Start menu and search for "Command Prompt." Right-click on the top result and select "Run as administrator." Then, type one of the following commands and press Enter:
- Powercfg -devicequery wake_armed to see a list of devices that are currently configured to wake the system from any sleep state.
- Powercfg -devicequery wake_from_any to see a list of all the hardware devices capable of waking up the computer from standby.
- Powercfg /requests to view app and driver power requests and understand which devices, apps, and drivers can actively wake the system from sleep or hibernation.
- Powercfg /devicequery wake_programmable to review devices that are not currently set to wake the computer.
After running these commands, you can take the necessary steps to prevent unwanted devices from waking your computer. You can do this by opening the Device Manager, locating the device, opening its Properties window, and checking or unchecking the "Allow this device to wake the computer" or Allow the computer to turn off this device to save power" checkbox.
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Using the Device Manager
To check which devices are waking your computer from sleep mode, you can use the Device Manager on your Windows or Mac system. Here's a detailed guide on how to do this:
For Windows users:
- Open the Start menu and search for "Device Manager." Open the application when it appears in the search results.
- In the Device Manager window, look for the
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Using Command Prompt or Windows PowerShell
To check which devices can wake your Windows PC from sleep mode, you can use Command Prompt or Windows PowerShell. Here's how:
- Press Win + S to open the search menu.
- Type Windows PowerShell and select Run as administrator.
- Select Yes when the User Account Control (UAC) prompt appears.
- Type the following command and press Enter to view a list of devices that can wake your PC from sleep mode:
> powercfg -devicequery wake_armed
You can also use the following commands to check for specific sleep states:
> powercfg -devicequery wake_from_any
> powercfg -devicequery wake_from_S1_supported
> powercfg -devicequery wake_from_S2_supported
> powercfg -devicequery wake_from_S3_supported
To find out what woke your PC from sleep mode the last time, type:
> powercfg -lastwake
- This will display the device that last woke your computer, such as a USB drive or a wireless device.
- You can also use the powercfg command to check the wake history:
> powercfg -waketimers
- This command will show you a list of applications and devices that are allowed to wake your PC, along with the time they last woke it up.
- Once you know which devices are waking your computer without your consent, you can manage their permissions:
- Press Win + X to open the Power User menu.
- Select Device Manager from the list.
- Locate the device you want to configure and right-click on it.
- Select Properties and switch to the Power Management tab.
- Check or uncheck the Allow this device to wake the computer checkbox to allow or deny permission.
- Click OK to save the changes.
By following these steps, you can easily identify and manage the devices that can wake your Windows PC from sleep mode.
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Frequently asked questions
Windows offers a Wake-on-Lan feature to some network devices that allows them to wake up the PC remotely. You can use Command Prompt or Windows PowerShell to determine which of your devices supports waking the computer. Press Win + S to open the search menu. Type in Windows PowerShell and select Run as administrator. Select Yes when the User Account Control (UAC) prompt appears. You can also use the POWERCFG command on Windows Terminal.
You can use the Terminal utility to find out what woke up your Mac computer.
Aside from your devices, your network connections, scheduled tasks, and background wake timers can also wake Windows from sleep mode.
You can take measures such as allowing the keyboard and mouse to wake up your computer, turning off Start Up, re-enabling hibernation, and modifying the Power Settings.
