Assume that you have update 2883200 installed on a computer that is running Windows RT 8.1, Windows 8.1, or Windows Server 2012 R2. When a device that is reported by the power engine plug-in (PEP) is not registered with the power management framework (PoFx), the computer cannot enter a Deepest Runtime Idle Power State (DRIPS).
To resolve this issue, install update rollup 2903939. For more information about how to obtain this update rollup package, click the following article number to view the article in the Microsoft Knowledge Base:
2903939 Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 update rollup: December 2013
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates