I've just picked up a UP2414Q and I've connected it via displayport 1.2 which runs 60hz. The issue is that it ends up showing X two screens, well kind of, so that I end up with it acting as if I've got two monitors within my one 24" frame.

I've gone through the nvidia settings and cannot find a way to get them to join up as a single wide display. I've found hints at doing things like

OPTION "TwinViewXineramaInfoOverride" "3840x2160+0+0"

or

Option "NoTwinViewXineramaInfo" "1"

Neither of which worked. I wonder if I'm missing another part to the puzzle. Any hints on how to correct up my config would be appreciated. I'm currently running a new daily build of trusty in the hopes that more recent X and nvidia drivers would help things out.

I've pasted below my current X config and linked to the X log below.

Here is a screenshot of the current dual display setup. Notice the window manager is acting as if there are two different monitors.

http://uploads.mitechie.com/xorg-setup.png

Logfile: http://paste.ubuntu.com/6654719/

xrandr output: http://paste.ubuntu.com/6669699/

# nvidia-settings: X configuration file generated by nvidia-settings

# nvidia-settings:  version 331.20  (buildd@batsu)  Mon Dec  9 17:08:08 UTC 2013

xdpyinfo -ext XINERAMA | tail -2

head #0: 1920x2160 @ 0,0

head #1: 1920x2160 @ 1920,0

xorg.conf

Section "ServerLayout"

    Identifier     "Layout0"

    Screen      0  "Screen0" 0 0

    InputDevice    "Keyboard0" "CoreKeyboard"

    InputDevice    "Mouse0" "CorePointer"

    Option         "Xinerama" "0"

EndSection



Section "Files"

EndSection



Section "InputDevice"



    # generated from default

    Identifier     "Mouse0"

    Driver         "mouse"

    Option         "Protocol" "auto"

    Option         "Device" "/dev/psaux"

    Option         "Emulate3Buttons" "no"

    Option         "ZAxisMapping" "4 5"

EndSection



Section "InputDevice"



    # generated from default

    Identifier     "Keyboard0"

    Driver         "kbd"

EndSection



Section "Monitor"



    # HorizSync source: edid, VertRefresh source: edid

    Identifier     "Monitor0"

    VendorName     "Unknown"

    ModelName      "DELL UP2414Q"

    HorizSync       31.0 - 140.0

    VertRefresh     29.0 - 75.0

    Option         "DPMS"

EndSection



Section "Device"

    Identifier     "Device0"

    Driver         "nvidia"

    VendorName     "NVIDIA Corporation"

    BoardName      "GeForce GTX 660 Ti"

EndSection



Section "Screen"



# Removed Option "metamodes" "DP-1.8: 1920x2160_60 +1920+0, DP-1.9: 1920x2160_60 +0+0"

    Identifier     "Screen0"

    Device         "Device0"

    Monitor        "Monitor0"

    DefaultDepth    24

    Option         "Stereo" "0"

    Option         "nvidiaXineramaInfoOrder" "DFP-4.8"

    Option         "metamodes" "DP-1.8: nvidia-auto-select +1920+0, DP-1.9: nvidia-auto-select +0+0"

    Option         "SLI" "Off"

    Option         "MultiGPU" "Off"

    Option         "BaseMosaic" "off"

    SubSection     "Display"

        Depth       24

    EndSubSection

EndSection

References:

• http://en.wikipedia.org/wiki/4K_resolution