By chance, do you use two of these... side-by-side?
>________________________________
> From: DJ Delorie <d...@delorie.com>
>To: Community support for Fedora users <users@lists.fedoraproject.org>
>Sent: Monday, April 29, 2013 12:40 PM
>Subject: Re: 3840x2160 resolution?
>
>
>$ xdpyinfo | grep dimensions
> dimensions: 6880x1600 pixels (1818x423 millimeters)
>
>That's four monitors on an ATI Radeon HD 6870 card, with proprietary
>drivers.
>
>Note: my solution to the widescreen monitor problem is to rotate them,
>making them tallscreen monitors instead.
>
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