External widescreen display renders abnormally when rotating screen to portrait mode in Windows 8

Symptoms
Consider the following scenario:
  • You have an LG V960 All-in-one computer that is running Windows 8.
  • You connect this computer to an external 21:9 widescreen monitor.
  • You configure the Orientation setting to Portrait or Portrait (flipped) in the Screen Resolution dialog box.
In this situation, the desktop background appears garbled on the external monitor.
Cause
This issue occurs because the code mistakenly returns an incorrect orientation mode.
Resolution

Update information

To resolve this issue, install update rollup 2919393. For more information about how to obtain this update rollup package, click the following article number to go to the article in the Microsoft Knowledge Base:
2919393 Windows RT, Windows 8, and Windows Server 2012 update rollup: February 2014
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
More information
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
Third-party information disclaimer

The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.
Properties

Article ID: 2917475 - Last Review: 03/11/2016 09:08:00 - Revision: 2.0

Windows 8, Windows 8 Enterprise, Windows 8 Pro, Windows RT

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