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I'm having problem with setting dual monitor in Ubuntu 13.10 with my newly acquired Nvidia GTX 780.

The two screens I have are:

//I won't identify the model name since I think its irrelevant

Left screen: ASUS 1920x1200 connected to HDMI on GTX 780

Right Screen: QNIX 2560x1440 connected to Dual link DVI on GTX 780

Both screen works perfectly after fresh Ubuntu installation, without installing any additional driver. Just slow and laggy.

The first thing I've tried is to install the official Nvidia driver from their site. I believe it was version 325. I followed the on screen instruction and successfully installed it. After reboot, ASUS (left) works with login screen but QNIX doesn't. It shows a continuously flashing black, white, R,G,B, grey screen. The setting in Displays shows ASUS identified as "Ancor Communications Inc 25"" while the QNIX is "Unknown Display". Resolution settings is only set to 800x600 on the QNIX.

Then I tried to uninstalled the Nvidia 325 driver and revert back to stock driver, and install the 319 driver from "Settings" -> "Software & Updates" -> "Additional Drivers". But things started to get messed up. Black screen etc. I think it may be caused by me messing up with the /etc/X11/x.org.config and not doing a sudo apt-get purge nvidia*

So I reinstalled Ubuntu 13.10 and tried the Additional Driver update with Nvidia 319-update to see if it works. But the same thing happened as the installation of 325 driver. Left screen works and right screen flashing colors.

I have tried to search for a solution but failed to find one that works for me. Is it a problem of the x.org.config file? (I have a feeling it does) Any help plz.

Update 1: xrandr shows the following results. Don't know if it matters.

Screen 0: minimum 8 x 8, current 2720 x 1920, maximum 16384 x 16384
DVI-I-0 disconnected (normal left inverted right x axis y axis)
DVI-I-1 disconnected (normal left inverted right x axis y axis)
HDMI-0 connected primary 1200x1920+0+0 left (normal left inverted right x axis y axis) 550mm x 340mm
   1920x1200      60.0*+
   1920x1080      59.9     50.0     60.0     50.0  
   1680x1050      60.0  
   1440x900       59.9  
   1440x576       50.1  
   1280x1024      75.0     60.0  
   1280x960       60.0  
   1280x720       60.0     59.9     50.0  
   1152x864       75.0  
   1024x768       75.0     70.1     60.0  
   800x600        75.0     72.2     60.3     56.2  
   720x576        50.0     50.1  
   720x480        59.9     60.1  
   640x480        75.0     72.8     59.9     59.9  
DP-0 disconnected (normal left inverted right x axis y axis)
DVI-D-0 connected 800x600+1920+0 (normal left inverted right x axis y axis) 0mm x 0mm
   800x600        60.3*+
DP-1 disconnected (normal left inverted right x axis y axis)
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This could be your answer askubuntu.com/questions/84060/… –  user2454305 Nov 18 '13 at 2:44
    
I've already read that before but will give some of the nvidia setting a try. Mess with it and see if any magic happens. –  gr33nmango Nov 18 '13 at 3:02
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