Assume that you close the lid to turn off the display of a portable computer that is running Windows 8.1, Windows RT 8.1, or Windows Server 2012 R2. When you reopen the lid, you may have to wait for several seconds before the display is turned on again. Additionally, you are not expected to tap the screen or press a key to turn on the display.
To resolve this issue, install update rollup 2975719. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
2975719 August 2014 update rollup for Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2
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