Allow This Device To Turn Off This Device To Save Power
Here's an interesting one I haven't seen on ServerFault I'd like to 'discuss' based on our rule regarding a question.I have a ton of Windows 2008/2012 VMs in my environment running under VMWare 5.1 and 5.5 clusters.There is a setting that is pretty common on NICs that allows to you check/uncheck stating Allow the computer to turn off this device to save power. The default is for this to be checked.
In the power management tab (device manager - TB controller - properties): 'Allow the computer to turn off this device to save power' However, whenever I reboot my computer, the option is checked again automatically.
The concept being to help save power if the NIC isn't plugged in and shown as enabled and active in Windows (is my understanding). EDIT: the before is actually an incorrect passed down falsehood.This KB article does a better job of explaining what this setting does: It doesn't simply turn off the device if there is some idle time.Now we get into the VM world side of things.Does such a setting have any bearing checked or unchecked on a VM? Unchecking it seems frivolous since the NIC isn't a physical device and isn't drawing any actual electrical power regardless.
But does leaving the box checked having any negative affects when Windows likes to believe it is a physical device? Should all VMs have this box checked or unchecked?
In order to make efficient use of electrical power, your Windows system manages to turn off the devices which are not currently used. You can configure these settings from the Device Manager. Right-click over the device and select Properties.Note 1 by Admin: The post has been edited.
Says one thing, but we are basing this post on. Please read the full post and comments first. Allow the computer to turn off this device to save powerIn the Power Management tab, you have to enable Allow the computer to turn off this device to save power and Windows will turn off the device when not in use so that power will not be wasted. But what if the same option is grayed out:One can see that you can’t adjust the mouse which is an external hardware device, to be turned off / on while not in use.So how to change this settings? Well, a registry manipulation will help you to fix this. This fix is applicable to the devices supporting Plug-n-Play ( PnP) capabilities. Here is how to do it.
Cannot Turn Off Mouse To Save Power In Device Manager1. Open Device Manager, by pressing Windows Key + R key combination and inputting devmgmt.msc in the Run dialog box and hit Enter.2. In the Device Manager, expand the Mice and other pointing devices, right click on the device and select Properties for which you’re facing the issue.3. Now in the Properties window, switch to Details tab, select the Property as Driver Key. Copy the key as shown below. The last portion after of the Value so copied is device number which is 0000 in our case – but if the option is grayed out you may see a value of 24.
Moving on, press Windows Key + R combination, type put Regedt32.exe in Run dialog box and hit Enter to open the Registry Editor.5. Navigate to the following location:HKEYLOCALMACHINESYSTEMCurrentControlSetControlClass Driver KeyWhere you have to substitute Driver Key obtained in step 3.6. In the right pane of this location, you’ve to look for the DWORD named PnPCapabilities. If the DWORD doesn’t exist, you can create it using right click - New - DWORD Value.
Double click on the same DWORD to modify its Value data.7. If the value is set at 24, that option gets grayed out.
Allow This Device To Turn Off This Device To Save Power Bill
So in the above-shown box, you have input the Value data to 0 in order to allow the computer to turn off the device while it is idle. You may now close the Registry Editor and reboot the machine to make changes effective.That’s it! Note 2 by Admin: We’ve updated the post with more details for the convenience of beginners. We also thank Anonymous, whose comments made a valuable contribution to better this post.
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So one can conclude that by default, a value of 0 indicates that power management of the network adapter is enabled. A value of 24 will prevent Windows from turning off the device or let the device wake the computer from standby.
Also gives you the option to use a Fix It, so we recommend that you use the easy to use Fix It to enable or disable network adapter power management on a single computer.