Article ID: 2740020 - View products that this article applies to.
The enhancements made to Windows 7 for managing power settings for network adapters greatly reduces the number of spurious wakes, allowing computers to sleep for longer periods of time when idle. Furthermore, you can configure the power management settings to meet the needs of your users through device properties, standard registry settings.
When deploying Windows 7 or Windows Server 2008 R2, you may want to disable the Allow the computer to turn off this device to save power network adapter power management setting on some computers.
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 and can be used if a driver misrepresents how it handles sleep states. Windows never turns off the network card due to inactivity. When this setting is checked(enabled), Windows puts the network card to sleep and when it resumes it puts it back to D0. When this setting is not checked(disabled), Windows completely halts the device and on resume reinitializes it. 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.
You can use Device Manager to change the power management settings for a network adapter. To disable this setting in Device Manager, expand Network Adapters, right-click the adapter, click Properties, click the Power Management tab, and then clear the Allow the computer to turn off this device to save power check box.
In Windows 7 or Windows Server 2008 R2, you have two additional check boxes on the Power Management tab for the Network Adapter that defines whether this device can wake the computer:
However, with some Windows 7 or Windows Server 2008 R2 installations, you may want to use the registry to disable the Allow the computer to turn off this device to save power network adapter power management setting or to configure the wake options described above.
How to use Registry Editor to disable network adapter power management on a single computerImportant This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/322756/ )How to back up and restore the registry in Windows
To have us disable or enable the network adapter power management setting for you, go to the "Fix it for me" section. If you prefer to disable or enable the network adapter power management setting yourself, go to the "Let me fix it myself" section.
Fix it for me
To disable or enable the network adapter power management setting automatically, click the Fix it button or link. Then click Run in the File Download dialog box, and follow the steps in the Fix it wizard.
Collapse this tableExpand this table
Then, go to the "Did this fix the problem?" section.
Let me fix it myselfTo use Registry Editor to disable the Allow the computer to turn off this device to save power network adapter setting for a single computer, follow these steps:
Did this fix the problem?
ADDITIONAL INFORMATIONYou have 3 options for the power management properties of the Network Card:
For deployment purpose, to keep the value for Allow the Computer to turn off this device to save powercleared, one needs to use the value 24 (0x18). Reason being, by default the option 1 and 2 are checked, which is same as DWORD value 0 of this key (even though the key does not exist in the registry by default). Hence, creating this key with a value 24 (0x18) in the deployment script/build process will inject this entry in the registry which in turn should uncheck the first box during server startup.
In the same way, if you want to keep the Allow the Computer to turn off this device to save power checked and the Option 2 and 3 cleared, the required value would be 10 (0x16).
Note: This is entirely by design.
For additional information about How to disable power management for a network adapter when you deploy Windows XP, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/837058/ )How to disable power management for a network adapter when you deploy Windows XP
(http://go.microsoft.com/fwlink/?LinkId=151500)for other considerations.
Article ID: 2740020 - Last Review: November 2, 2012 - Revision: 2.0