Herbie Murray
Whether USB ports continue to work in sleep mode depends on the device and its settings. For example, on some HP laptops, the USB ports remain powered when the device is connected to an AC power source and put into sleep mode. However, when the same laptop is on battery power and put to sleep, the USB ports are powered off. Users can also adjust power settings on Windows to keep USB ports supplying power in sleep mode by unchecking Allow the computer to turn off this device to save power.
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What You'll Learn
- USB ports may work in sleep mode if the laptop is connected to an AC source
- To stop Windows from powering down USB devices, disable the USB Selective Suspend setting
- To keep USB ports supplying power in sleep mode, uncheck Allow the computer to turn off this device to save power
- The Device Manager in Windows may allow a device to wake the computer and provide power when asleep
- Some motherboards have power to the USB ports when the PC is powered down, but this is not always the case
USB ports may work in sleep mode if the laptop is connected to an AC source
It is possible for USB ports to remain powered and functional when a laptop enters sleep mode. This behaviour has been observed on Windows 10 laptops, where the USB ports remain active when the laptop is connected to an AC power source and put into sleep mode. This can be useful for charging devices or powering accessories like a wireless mouse or headset.
However, it is important to note that this behaviour may not be consistent across all laptop models and operating systems. Some users have reported issues with USB devices not working properly after their laptops wake up from sleep mode. In some cases, the devices are not recognised until they are unplugged and plugged back in. This inconsistency in behaviour can be frustrating for users who rely on USB devices.
To address this issue, some users have explored various solutions. One common approach is to adjust power settings in the Device Manager or Control Panel. For example, disabling "USB Selective Suspend" can prevent the computer from powering down USB devices during sleep mode. Additionally, changing the laptop's behaviour to enter hibernation mode instead of sleep mode can help, as Windows does allow USB ports to be shut down during hibernation.
Another workaround suggested by some users is to use a USB hub with power switches instead of the onboard USB ports. This provides the ability to manually control power to the USB devices, ensuring they are turned off when the laptop is in sleep mode. While these workarounds can be helpful, a more permanent solution would be ideal for users who prefer to utilise sleep mode without sacrificing USB functionality.
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To stop Windows from powering down USB devices, disable the USB Selective Suspend setting
USB selective suspend is a Windows feature that allows the system to power down idle USB devices while the computer remains on. This feature is useful for conserving battery power, especially on portable computers. However, if you want to prevent Windows from powering down USB devices, you can disable the USB Selective Suspend setting. Here's how to do it:
- Open the Power Options menu in the Windows Control Panel.
- Expand the USB settings and locate the USB selective suspend setting.
- Choose "Disabled" in the "Plugged in" drop-down menu. If your device is battery-powered, you can also select "Disabled" in the "On battery" drop-down menu.
- Click or tap "OK" to save the changes.
Disabling USB Selective Suspend will prevent your USB ports from entering a low-power state during sleep mode, ensuring that they remain active even when the computer is idle. It's worth noting that this may impact power consumption, especially on mobile PCs, as the feature is designed for energy efficiency.
Additionally, you can refer to your BIOS settings to ensure that Erp or EuP is disabled. This setting can also impact the power supplied to USB ports when the computer is asleep or powered off.
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To keep USB ports supplying power in sleep mode, uncheck Allow the computer to turn off this device to save power
If you want to keep your USB ports supplying power while your Windows PC is in sleep mode, you can do so by adjusting the power settings. This can be done by accessing the Power Management tab in the Device Manager and unchecking the "Allow the computer to turn off this device to save power" option for all the USB Root Hubs. This will prevent Windows from turning off the USB ports to conserve power when the system enters sleep mode.
To access these settings, open the Device Manager and locate the Power Management tab. Under this tab, you will find the "Allow the computer to turn off this device to save power" setting. Simply uncheck this box to ensure that the USB ports remain powered while the computer sleeps.
Additionally, you can explore advanced power settings to fine-tune USB power behaviour during sleep mode. This can be achieved by opening the Power Options window (by pressing Windows key + R, typing "powercfg.cpl", and pressing Enter), clicking on “Change plan settings" for your current power plan, and then selecting "Change advanced power settings". From here, you can adjust USB settings, such as the "USB Selective Suspend Setting," to customise power delivery to USB ports while the system sleeps.
It is worth noting that, in some cases, the behaviour of USB ports during sleep mode may be influenced by factors such as the power source of the computer. For example, it has been observed that USB ports on laptops may remain powered when the device is connected to an AC power source and enters sleep mode, while they may power off when the laptop is running on battery power alone.
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The Device Manager in Windows may allow a device to wake the computer and provide power when asleep
If you want to allow a device to wake your Windows computer from sleep mode, you can do so via the Device Manager.
First, open the Start menu and search for "Device Manager". Find the device in question in the resulting list, right-click on it, and select "Properties". Then, click on the Power Management tab and check the "Allow this device to wake the computer" option. Click "OK" to confirm.
You can also use the Windows Terminal to see a list of all devices that are configured to wake the computer. To do this, open Windows Terminal (Admin) and select either Windows PowerShell or Command Prompt. Then, copy and paste the following command and press Enter:
Powercfg -devicequery wake_armed
Note that you will need to be signed in as an administrator to enable or disable a device to wake the computer.
Additionally, you can change the Power settings in Windows to prevent the computer from going into Sleep mode when plugged in. This can be useful if you want to keep USB power on when the computer is asleep.
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Some motherboards have power to the USB ports when the PC is powered down, but this is not always the case
Whether or not USB ports on a PC remain powered when the computer is in sleep mode depends on a variety of factors. For example, the type of PC, the operating system, and the specific USB port or hub in question can all play a role.
In general, it seems that PCs commonly continue to provide power to USB ports when in sleep mode, especially if the PC is plugged into an AC power source. This can be useful for charging devices or keeping accessories like wireless mice and keyboards powered. However, some users have reported issues with USB ports not working properly after their PC has entered sleep mode, requiring a restart or unplugging and replugging the device.
It is worth noting that Microsoft does not allow users to shut down USB ports when their Windows PC goes into sleep mode, forcing users to either shut down or hibernate their computers if they want to completely power off USB ports. Additionally, some PCs may have settings to disable USB selective suspend, which allows the computer to put USB ports into a low-power state during sleep mode without turning them off completely.
To summarise, while some motherboard configurations do provide power to USB ports when the PC is in sleep mode, this is not always the case, and users may need to experiment with different settings or workarounds to achieve their desired level of USB port functionality during sleep mode.
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Frequently asked questions
To stop your USB ports from powering down, go to "USB Settings" and then "USB Selective Suspend Setting". Set it to Disabled and click "Apply" to save your changes.
In the Power Management tab, uncheck the box that says "Allow the computer to turn off this device to save power". Repeat for all USB Root Hubs on the computer.
Press the Windows key + R to open the Run box. Type "powercfg.cpl" and press Enter. When the Power Options window opens, click the "Change plan settings" link and then the "Change advanced power settings" link.
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