Kubuntu 14.04 + Lenovo X240 + Thinkpad Ultra Dock 90w - multiply display

Operating system - Kubuntu 14.04
I have Lenovo X240 two Dell monitors connected to DP1 and DP2 of the Thinkpad Ultra Dock 90w.
Now it works only in next modes:
Two connected monitors works in clone mode (each 1920x1080).
Two connected monitors works as one big monitor with 3840x1080 resolution.
So, looks that both monitors are connected to "DP2" output of the xrand.
Are anybody know how to force to work two connected monitors in 'extend desktop' mode, so each should be 1920x1080 but no clone?
Output of the xrand is below:
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 32767 x 32767
eDP1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 276mm x 156mm
1920x1080 60.0*+ 59.9
1680x1050 60.0 59.9
1600x1024 60.2
1400x1050 60.0
1280x1024 60.0
1440x900 59.9
1280x960 60.0
1360x768 59.8 60.0
1152x864 60.0
1024x768 60.0
800x600 60.3 56.2
640x480 59.9
DP1 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
DP2 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 510mm x 287mm
1920x1080 60.0*+
3840x1080 60.0
2560x1024 60.0
1280x1024 75.0 60.0
1152x864 75.0
1024x768 75.1 60.0
800x600 75.0 60.3
640x480 75.0 60.0
720x400 70.1
HDMI2 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)

Seems that there is no solution now, because DP MST should be implemented in Linux: https://bugs.freedesktop.org/show_bug.cgi?id=72795

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