Windows 10 具有多项可降低功耗的内置功能(built-in features that reduce power consumption)。有一个系统范围的电池保护程序(Battery Saver)、一个电源(Power)故障排除程序、USB选择性挂起等等。这些功能有助于延长 Windows PC 的电池寿命(extend the battery life of your Windows PC)。
在这个解释器中，我们将带您了解“ USB(USB)选择性挂起”背后的复杂性，它在您的Windows计算机上的作用，以及在出现问题时如何禁用该功能。
什么是 USB 选择性挂起？
当您将许多外部设备、附件和外围设备插入USB(USB)端口时，它们会从您的 PC 中获取电力。如果您的计算机使用电池供电，这些外部设备将比平时更快地耗尽您的电池。这就是Windows暂时挂起空闲USB设备以节省电池电量的原因。
比如说(Say)，有一个USB指纹读取器连接到您的计算机，而您已经一个多小时没有使用它了。Windows可能会挂起设备并将其置于“低功耗状态”，在这种状态下它消耗的电池电量非常少。将其视为Windows 休眠或让您的 USB 设备进入睡眠状态(hibernating or putting your USB device to sleep)。如果您有多个设备连接到您的 PC，Windows只会挂起空闲的USB设备和端口。
USB选择性地休眠被动USB设备以节省电池电量。这就是该功能的全部内容。请参阅此 Microsoft 官方文档(this official Microsoft documentation)以了解有关该功能的更多信息。
与USB 选择性挂起相关的问题(USB Selective Suspend)
如上所述，很明显，USB选择性挂起对 PC 的电池寿命有巨大的好处。但是，在某些情况下，该设置会导致某些USB设备冻结或无响应——主要是当您的 PC 闲置时间过长时。
(USB)默认情况下，所有Windows(Windows)设备都启用USB选择性挂起。虽然我们建议在电池供电的计算机上启用USB选择性挂起，但如果遇到与USB相关的问题，则应禁用该功能。比如说(Say)，您的USB 驱动器停止显示在文件资源管理器(USB drive stopped showing up in the File Explorer)中。或者，您的Windows PC won’t detect a USB keyboard/mouse。
如何在Windows 10上禁用(Windows 10)USB 选择性挂起(USB Selective Suspend)
禁用USB选择性挂起是一种有效的故障排除解决方案，可以解决上述USB相关问题。总有几种方法可以完成这项工作。
在下面的部分中，我们将向您展示如何从控制面板(Control Panel)、设备管理器(Device Manager)或使用命令提示符禁用(Command Prompt)USB选择性挂起。
从控制面板(Control Panel)禁用USB 选择性挂起(USB Selective Suspend)
防止您的 PC 暂时挂起 USB 设备(prevent your PC from temporarily suspending USB devices)的一种方法是编辑Windows电源设置。请按照以下步骤进行操作。
1.启动 Windows 控制面板(Launch the Windows Control Panel)并将“查看方式”选项设置为类别(Category)。
2. 打开系统和安全(System and Security)菜单并选择电源选项(Power Options)。
3. 选择当前电源计划旁边的更改计划设置选项 -(Change plan settings)平衡(Balanced)或省电(Power Saver)或高性能(High Performance)。
4. 选择更改高级电源设置(Change advanced power settings)。这将打开一个新的“电源选项”窗口。
5. 展开USB 设置(USB Settings)部分并双击USB 选择性暂停设置(USB selective suspend setting)。
如果您使用的是笔记本电脑或平板电脑，您会在USB选择性挂起设置中找到两个选项：“使用电池”和“插入”。理想情况下，您只想在 PC 使用电池供电时启用该功能，因为USB选择性挂起旨在延长电池寿命。但是，Windows让您可以自由禁用两个电源选项的USB选择性挂起。
6. 双击您要自定义的电源计划（“On battery”或“Pluged in”）旁边的Enabled选项，然后选择(Enabled)Disabled。
7. 选择应用(Apply)，然后选择确定(OK)以保存新的USB选择性挂起设置。
请注意，USB选择性挂起配置对于您当前/首选的电源计划是唯一的。如果您切换计划（例如从“平衡”到“节电”），您需要重复这些步骤并为新的电池计划禁用USB选择性暂停。
快速提示：(Quick Tip:)您可以更改另一个电源计划的USB选择性挂起设置，而无需返回控制面板(Control Panel)。单击(Click)显示“活动”计划的下拉按钮，选择另一个电源计划，然后展开USB设置部分并继续禁用USB选择性挂起。
从设备管理器
您还可以通过修改为 PC 的USB端口供电的驱动程序的电源管理设置来禁用USB选择性挂起。(USB)这是您需要做的：
1. 右键单击开始(Start)图标并在快速访问菜单上选择设备管理器。(Device Manager)
2. 展开通用串行总线控制器(Universal Serial Bus controllers)部分，右键单击任何“通用 USB 集线器”或“USB 根集线器”驱动程序，然后选择属性(Properties)。
注意：(Note:) “ USB Root Hub”管理您 PC 的USB端口，以兼容低速和高速设备/连接。另一方面，“通用USB集线器”为USB集线器设备和附件供电。
3. 转到电源管理(Power Management)选项卡并取消选择“允许计算机关闭此设备以节省电源”。
4. 最后，选择OK保存设置。对计算机上的所有相关USB(USB)驱动程序重复(Repeat)这些步骤。
使用命令提示符禁用USB 选择性挂起(USB Selective Suspend Using Command Prompt)
命令提示符(Command Prompt)是一种可用于执行各种操作的工具。通过在工具中输入特定的命令行(entering specific command lines)，您可以修改系统配置、修复损坏的文件(repair corrupt files)、调整电源管理设置等等。
我们将向您展示如何禁用USB选择性挂起。
1. 右键单击开始(Start)菜单并选择运行(Run)，或使用Windows 键(Windows key)+ R快捷键。
2. 在命令提示符(Command Prompt)控制台中键入或粘贴以下命令，然后按Enter。
powercfg /SETACVALUEINDEX SCHEME_CURRENT 2a737441-1930-4402-8d77-b2bebba308a3 48e6b7a6-50f5-4782-a5d4-53bb8f07e226 0
将有问题的USB设备重新连接到您的计算机并检查它现在是否正常工作。
更多故障排除技术
您(Are)还在使用USB设备时遇到问题吗？或者，尽管尝试了上述方法，您的 PC 是否没有禁用USB选择性挂起？(USB)重新启动(Restart)计算机并检查是否有任何改变。Windows也可能无法识别松散地插入计算机的USB设备。(USB)因此(Hence)，请确保您将设备紧紧地插入美国端口 - 或使用另一个USB端口。
如果问题仍然存在，则您的USB(USB)驱动程序可能存在问题。打开Windows 设备管理器(Windows Device Manager)并更新您 PC 的 USB 驱动程序(update your PC’s USB drivers)。相反，将 USB 驱动程序回滚到以前的版本也可以解决问题。
What is USB Selective Suspend on Windows 10 and How to Disable It
Windows 10 has severаl built-in features that reduce power consumption. There’s a system-wide Battery Saver, a Power troubleshooter, USB selective suspend, and more. These features help to extend the battery life of your Windows PC.
In this explainer, we’ll walk you through the intricacies behind “USB selective suspend,” what it does on your Windows computer, and how to disable the feature if it ever poses a problem.
What is USB Selective Suspend?
Many external devices, accessories, and peripherals draw power from your PC when you plug them into a USB port. If your computer runs on battery power, these external devices will deplete your battery faster than usual. That’s why Windows temporarily suspends idle USB devices to conserve battery power.
Say, for example, there’s a USB fingerprint reader connected to your computer, and you haven’t used it for over an hour. Windows may suspend the device and put it in a “low power state” where it consumes very little battery power. Think of it as Windows hibernating or putting your USB device to sleep. If you have several devices connected to your PC, Windows will only suspend the idle USB devices and ports.
USB selectively hibernates passive USB devices to save battery power. That’s all there is to the feature. Refer to this official Microsoft documentation to learn more about the feature.
Problems Associated With USB Selective Suspend
As described above, it’s clear that USB selective suspend has immense benefits on your PC’s battery life. However, there are instances when the setting causes some USB devices to freeze or become unresponsive—mainly when your PC stays idle for too long.
USB selective suspend is enabled by default on all Windows devices. While we recommend leaving USB selective suspend enabled on your battery-powered computer, you should disable the feature if you’re having USB-related troubles. Say, for instance, your USB drive stopped showing up in the File Explorer. Or, your Windows PC won’t detect a USB keyboard/mouse.
How to Disable USB Selective Suspend on Windows 10
Disabling USB selective suspend is an effective troubleshooting solution that can resolve the mentioned USB-related issues. There are always several ways to get this done.
In the sections below, we’ll show you how to disable USB selective suspend from the Control Panel, Device Manager, or by using the Command Prompt.
Disable USB Selective Suspend From the Control Panel
One way to prevent your PC from temporarily suspending USB devices is to edit the Windows power settings. Follow the steps below for direction.
1. Launch the Windows Control Panel and set the “View by” option to Category.
2. Open the System and Security menu and select Power Options.
3. Select the Change plan settings option next to your current power plan — Balanced or Power Saver or High Performance.
4. Select Change advanced power settings. That will open a new “Power Options” window.
5. Expand the USB Settings section and double-click USB selective suspend setting.
If you’re using a laptop or tablet, you’ll find two options in the USB selective suspend settings: “On Battery” and “Plugged In.” Ideally, you’d only want to enable the feature when your PC is on battery power—since USB selective suspend is designed to extend battery life. However, Windows hands you the liberty to disable USB selective suspend for both power options.
6. Double-click the Enabled option next to the power plan you want to customize (“On battery” or “Plugged in”) and select Disabled.
7. Select Apply and then OK to save the new USB selective suspend setting.
Note that the USB selective suspend configuration is unique to your current/preferred power plan. If you switch plans (say from “Balanced” to “Power saver”), you’ll need to repeat these steps and disable USB selective suspend for the new battery plan.
Quick Tip: You can change the USB selective suspend setting for another power plan without going back to the Control Panel. Click the drop-down button showing the “Active” plan, select another power plan, and expand the USB settings section and proceed to disable USB selective suspend.
From the Device Manager
You can also disable USB selective suspend by modifying the power management setting of the drivers powering your PC’s USB ports. Here’s what you need to do:
1. Right-click the Start icon and select Device Manager on the Quick Access menu.
2. Expand the Universal Serial Bus controllers section, right-click any of the “Generic USB Hub” or “USB Root Hub” drivers, and select Properties.
Note: The “USB Root Hub” manages your PC’s USB ports for compatibility with low and high-speed devices/connections. On the other hand, “Generic USB Hub” powers USB hub devices and accessories.
3. Go to the Power Management tab and deselect “Allow the computer to turn off this device to save power.”
4. Finally, select OK to save the setting. Repeat these steps for all relevant USB drivers on your computer.
Disable USB Selective Suspend Using Command Prompt
The Command Prompt is a tool that you can use to perform a wide range of operations. By entering specific command lines in the tool, you can modify system configurations, repair corrupt files, adjust power management settings, and lots more.
We’ll show you how to disable USB selective suspend.
1. Right-click the Start menu and select Run, or use the Windows key + R shortcut.
2. Type or paste the command below in the Command Prompt console and press Enter.
powercfg /SETACVALUEINDEX SCHEME_CURRENT 2a737441-1930-4402-8d77-b2bebba308a3 48e6b7a6-50f5-4782-a5d4-53bb8f07e226 0
Reconnect the problematic USB device to your computer and check if it now works correctly.
More Troubleshooting Techniques
Are you still having problems using USB devices? Or, does your PC not disable USB selective suspend despite trying the methods mentioned above? Restart your computer and check if that changes anything. Windows may also fail to recognize a USB device that’s loosely plugged into your computer. Hence, ensure you fit the device tightly into the US port—or use another USB port.
If the issue persists, there could be a problem with your USB drivers. Open the Windows Device Manager and update your PC’s USB drivers. Conversely, rolling back the USB drivers to a previous version may also fix the problem.
