- You have a Portrait-First device that is running Windows 8.1.
- You have update 2904594 installed on the device and update the Intel GFX driver to test build 10.18.10.3341.
Note For more information about update 2904594, click the following article number to view the article in the Microsoft Knowledge Base:2904594 You cannot duplicate the display to the second monitor on a Portrait-First device that is running Windows 8.1
- You connect the device to an external display device by using an HDMI cable or a Miracast adapter.
- You start a camera app or a Skype video call on the device.
Update informationTo resolve this issue, install update rollup 2911106. 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:
Article ID: 2908931 - Last Review: 14 Jan 2014 - Revision: 1