To disable this setting in Device Manager, expand Network Adapters, right-click the adapter, select Properties, select the Power Management tab, and then clear the Allow the computer to turn off this device to save power check box. You can use Device Manager to change the power management settings for a network adapter. This setting is useful if a network card driver says it supports going to different sleep states and back to D0 but it ultimately doesn't support this functionality. When this setting isn't checked(disabled), Windows completely halts the device and on resume reinitializes it. When this setting is checked(enabled), Windows puts the network card to sleep and when it resumes it puts it back to D0. Windows never turns off the network card due to inactivity. This setting can be used if a driver misrepresents how it handles sleep states. The Allow the computer to turn off this device to save power setting controls how the network card is handled when the computer enters sleep. For more information about NetAdapterCx drivers, see User Control of Device Idle and Wake Behavior. This article does not apply to NetAdapterCx drivers.
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