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What is USB Selective Suspend?
USB Selective Suspend is a power-saving feature in Windows operating systems that allows the system to selectively suspend the power supply to unused USB devices. It was introduced to reduce power consumption and extend the battery life of laptops and other portable devices.
When a USB device is connected to a computer, it typically remains active and consumes power even when it is not in use. However, with USB Selective Suspend enabled, the system can automatically suspend the power supply to USB devices that are idle or not actively transferring data.
How does USB Selective Suspend work?
USB Selective Suspend operates by instructing the USB host controller to put specific USB devices into a low-power state when they are not actively being used. This low-power state, also known as the suspended state, allows the USB device to conserve energy by significantly reducing the power it consumes.
When a USB device is suspended, it remains physically connected to the computer but is effectively turned off to conserve power. However, it can quickly wake up and become fully operational as soon as it is required by the system or user.
Benefits of USB Selective Suspend
USB Selective Suspend offers several advantages, including:
1. Power-saving: By selectively suspending power to USB devices, it helps reduce overall power consumption, especially in situations where multiple USB devices are connected.
2. Extended battery life: By conserving power, USB Selective Suspend helps extend the battery life of laptops, tablets, and other portable devices. This is especially beneficial when operating on battery power.
3. Preventing device issues: Some USB devices can experience conflicts or compatibility issues when connected for extended periods. By suspending power to unused devices, it can help prevent such issues and improve system stability.
Enabling and Configuring USB Selective Suspend
USB Selective Suspend is a feature that can be enabled or disabled on Windows operating systems. Here’s how to configure it:
1. Open the Power Options settings on your Windows computer.
2. Select the power plan you want to configure and click on “Change plan settings.”
3. Click on “Change advanced power settings.”
4. In the advanced power settings window, navigate to the “USB settings” category.
5. Expand the “USB selective suspend setting” option and customize the settings to your preference. You can choose to enable or disable USB Selective Suspend for both battery and plugged-in power modes.
6. Click “Apply” and “OK” to save the changes.
It’s worth noting that not all USB devices may be affected by USB Selective Suspend. Some devices, such as keyboards, mice, and network adapters, may be exempt from suspension to ensure uninterrupted operation.
In conclusion, USB Selective Suspend is a power-saving feature that allows Windows systems to intelligently suspend the power supply to idle USB devices, reducing power consumption and extending battery life. It is a useful feature to optimize energy usage without sacrificing functionality or convenience.
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