Ashwin Lewis
Computers will often continue to provide power to USB ports when in sleep mode, which can be useful for charging devices. However, this is not always the case, and there are several steps you can take to ensure USB power remains on when your computer is asleep. These include disabling ErP or EuP in the BIOS settings, enabling USB standby power in the ACPI power settings, and disabling USB selective suspend in the Advanced Power Options menu.
Characteristics and Values
| Characteristics | Values |
|---|---|
| Do USB ports work when a computer is in sleep mode? | Yes, but only when the computer is connected to an AC power source. |
| How to enable USB ports when the computer is in sleep mode? | 1. Go to Device Manager, then USB settings, then Power Management, and then disable the option that allows the computer to turn off the USB port to save power. 2. Go to the Advanced Power Options menu, then USB selective suspend setting, and then disable the setting. |
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What You'll Learn
PCs can charge devices via USB in sleep mode
PCs can charge devices via USB when in sleep mode, although this is not always the default setting. In the Advanced Power Options menu, there is an option to enable or disable USB selective suspend. This setting allows your computer to put USB ports into a low-power state during sleep, rather than turning them off entirely. Disabling USB selective suspend will allow your PC to charge devices via USB in sleep mode.
To disable USB selective suspend on your PC, follow these steps:
- Open the Power Options item in the Control Panel.
- Click the "Choose what the power buttons do" link.
- Click "Change settings that are currently unavailable."
- Turn on the "USB selective suspend" checkbox.
- Click "Save changes."
Additionally, you can ensure that your PC continues to provide power to USB ports when in sleep mode by checking the ACPI settings. To do this, go into the device manager and untick "Allow the computer to turn off this device to save power." You can also try disabling ErP or EuP in the BIOS settings, as these settings may interfere with USB power delivery during sleep mode.
It is worth noting that some laptops will only keep USB ports powered during sleep mode when connected to an AC power source. When running on battery power, USB ports may be powered off to conserve energy. Therefore, it is recommended to check your laptop's specific behavior and requirements through the manufacturer's support resources or community forums.
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USB power can be enabled in BIOS settings
To enable this feature, you can check your BIOS settings. First, open the Power Option item in the control panel. Then, click the "Choose what the power button does" link. After that, click "Change settings that are currently unavailable". At this point, you should turn on the fast startup checkbox and click "Save changes".
Next, click "South Bridge configuration" under Advanced. Then, click "Deep sleep" to Disabled, and press F10 to save. Note that to enable USB standby power, ACPI power-on settings must be enabled.
Additionally, you should check if Erp or EuP is enabled in the BIOS settings. If it is, be sure to disable it.
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Disabling USB selective suspend stops USB power-down
USB selective suspend is a power-saving feature that is available on Windows operating systems. It allows the user to put USB devices into a very low-power state when they are not in use, while the computer remains in the working state. This feature is particularly useful for devices that only require power intermittently, such as fingerprint readers and other biometric scanners. By suspending these devices when they are idle, the overall power consumption is reduced.
There are two mechanisms for selectively suspending a USB device: idle request IRPs (IOCTL_INTERNAL_USB_SUBMIT_IDLE_NOTIFICATION) and set power IRPs (IRP_MN_SET_POWER). The mechanism used depends on the operating system and the type of device. For example, on Windows XP, client drivers must use idle request IRPs to power down their devices, while on Windows Vista and later versions, drivers have more choices and are not required to use this mechanism.
Disabling USB selective suspend can be done through the Advanced Power Options menu. This will prevent the USB ports from being put into a low-power state when the computer is asleep, and instead keep them powered on. However, it is important to note that disabling this feature may cause the computer to draw more power. It is only recommended to change this setting when experiencing problems with a USB device.
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USB power delivery in Soft Off State (S5)
The "USB power delivery in Soft Off State (S5)" setting allows users to control whether USB ports remain powered when a PC is in the S5 state, which is when the computer is turned off. This setting is typically found in the BIOS (Basic Input/Output System) settings of a PC.
In the BIOS settings, users can configure the "USB power delivery in Soft Off State (S5)" option to either "Enabled" or "Disabled". When set to "Enabled," the USB ports will remain powered even when the PC is turned off, allowing devices to be charged or powered via the USB ports. This can be useful for charging devices or powering peripherals when the computer is not in use.
However, it is important to note that enabling this setting may cause a slight power draw, as the USB ports will always be powered. Additionally, in some cases, certain USB ports may still not function properly even when this setting is enabled, as reported by some users. It appears that the behaviour of USB ports when the computer is in the Soft Off State (S5) can vary depending on the specific hardware and BIOS configuration.
On the other hand, when the "USB power delivery in Soft Off State (S5)" setting is set to "Disabled," the USB ports will not be powered when the PC is in the S5 state. This can be useful for conserving power and ensuring that no power is drawn by the USB ports when the computer is turned off.
It is worth noting that there are other power settings and features that can interfere with USB power delivery when the PC is turned off. For example, the ErP (Energy-related Products) or EuP (Energy-using Products) setting, when enabled, can cause the USB ports to lose power when the PC is in the S4 or S5 state. The "USB selective suspend" setting in the Advanced Power Options menu of Windows also allows the computer to put USB ports into a low-power state during sleep, rather than turning them off completely.
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HP laptops: USB ports powered in sleep mode when AC-powered
Many HP laptop users have reported that their USB ports remain powered when their laptops are in sleep mode and connected to an AC power source. This can be observed through accessories connected to the laptop, which continue to function even when the laptop is sleeping.
To address this issue, HP has provided some troubleshooting steps. One suggestion is to enable or disable power saving on USB ports through the Device Manager in the Control Panel. Specifically, users can navigate to the "Device Manager" and then to the "USB settings." From there, they can adjust the "Power management" settings to "Allow this to turn off by the computer."
Another possible solution is to disable the "Selective suspension of USB ports" in the Control Panel. Additionally, users can try disabling the "Allow the computer to turn off this device to save power" option for all USB devices.
It is worth noting that some users have reported that the above methods did not resolve the issue. In such cases, HP recommends performing a system reset or contacting their phone support for further assistance.
Furthermore, it is important to be cautious of scammers posing as HP support and posting fake phone numbers or email addresses. Official HP support can be accessed through the HP website or authorized support channels.
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Frequently asked questions
Yes, USB ports will usually still work when a computer is in sleep mode, and can be used to charge devices.
Yes, when a computer is connected to an AC power source and put into sleep mode, the USB ports will remain powered.
No, when a computer is running on battery and is put into sleep mode, the USB ports will be powered off.
To keep USB ports powered on when a computer is in sleep mode, you can disable USB selective suspend in the Advanced Power Options menu.
