I have the same problem as the post below.
Ubuntu 14.04 and Dell Latitude E5540 Multiple Monitors not working
System: Dell E7240
Video: Intel Haswell
Dock: Dell
Monitors: 2 x DVI Dell 19in Wide
The screens are on and both get a signal. One monitor replicates the other. It seems that Ubuntu doesn't recognize that their are 2 monitors.
Any help with how to resolve this would be much appreciated. Thx
lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation Haswell-ULT Integrated Graphics Controller (rev 0b)
xrandr --query
Screen 0: minimum 8 x 8, current 1440 x 900, maximum 32767 x 32767
eDP1 connected (normal left inverted right x axis y axis)
1366x768 60.0 + 40.0
1360x768 59.8 60.0
1024x768 60.0
800x600 60.3 56.2
640x480 59.9
HDMI1 disconnected (normal left inverted right x axis y axis)
DP1 connected primary 1440x900+0+0 (normal left inverted right x axis y axis) 408mm x 255mm
1440x900 59.9*+ 75.0
2560x1024 60.0
2880x900 60.0
1280x1024 75.0 60.0
1280x800 59.8
1152x864 75.0
1024x768 75.1 70.1 60.0
832x624 74.6
800x600 72.2 75.0 60.3 56.2
640x480 75.0 72.8 66.7 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)