I just installed Ubuntu 14.04.01 LTS on my secondary partition on my Solid State Drive. I noticed that when I went into System Settings --> Displays --> Detect Displays, my system is not detecting the second Acer monitor I have set up.
Other details that my be relevant is that I have a Nvidia GTX 750 TI and the Dell monitor is connected to the video card via DVI and the Acer monitor that is not detecting is connected to the video card through HDMI cable cord.
Please let me know if there is anything I can do to trouble shoot this. I'm sure it is not a hardware issue because the dual monitor set up works on my windows 8.1 OS partition. Happy holidays!