two monitors without mirroring

Question

I have a trouble - I have ubuntu 13.04 with Cinnamon installed, and when I connect to monitor, it makes this:

I want it to make two split monitors with same dimensions. Is it possible to make it? My graphic card ATI RS690M [Radeon X1200 Series] (source: HWINFO)

When I connect to second monitor (even monitor even projector), the first monitor devides to thirds. The right third displays part of content that should be on second display (rest of content displays corectly, but without this part), and don't work properly. Here is scheme:

---

HWINFO: Hardware Class: graphics card Model: "ATI RS690M [Radeon X1200 Series]" Vendor: pci 0x1002 "ATI Technologies Inc" Device: pci 0x791f "RS690M [Radeon X1200 Series]"

I havent installed any extra driver (maybe thats the problem??)

XRANDR said this:

Screen 0: minimum 320 x 200, current 2080 x 800, maximum 8192 x 8192
VGA-0 connected 800x600+1280+200 (normal left inverted right x axis y axis) 338mm x 270mm
   1280x1024      75.0     60.0  
   1024x768       75.1     70.1     60.0  
   832x624        74.6  
   800x600        72.2     75.0*    60.3     56.2  
   640x480        72.8     75.0     66.7     60.0  
   720x400        70.1  
LVDS connected 1280x800+0+0 (normal left inverted right x axis y axis) 331mm x 207mm
   1280x800       59.9*+
   1280x720       59.9  
   1152x768       59.8  
   1024x768       59.9  
   800x600        59.9  
   848x480        59.7  
   720x480        59.7  
   640x480        59.4  

Havent found any xorg.conf file in /etc/

Answer 1

You can setup the resolution of each monitor separately. Problem is, what I see from the screenshot (jásej jásej... zdravím) you want to use an data-projector as second monitor. Projectors usually has lower resolution than your display. Therefore you have to decrease resolution of your primary display or to buy a new projector with higher resolution ability.

Not every time projectors are correctly detected and then display offers just a basic resolutions, regardless the projector offers more resolutions or not. Try to play with display resolution settings.

try to follow this questions: Resolution and screens not detected properly , Monitor not detected - low resolution only

Additionally, you can prepare some scripts which can switch your resolutions flexible there and back. Employ xrandr to setup proper modes. For example following command will put my external display right of the main notebook display

xrandr --output VGA-0 --auto --right-of LVDS-0

this script will run cloning of the notebook display on VGA

xrandr --output VGA-0 --same-as LVDS-0

and this will switch my VGA off:

xrandr --output VGA-0 --off

You should use output names specific to your system. You can add specific resolutions to each output into the command. Good answers how to do that are here: How can I make xrandr customization permanent?

Edit: Now I understand your problem better. I found something about similar problem here http://ubuntuforums.org/showthread.php?t=2006533 , but without clear solution. So you are not the only one. Seems like for cloning displays, the external monitor forces wrong resolution to your notebook display. It would be necessary to know more about your system:

1. What is your graphics card?
2. Did you install specific drivers as Catalyst for Nvidia?
3. what is the result of xrandr command when second display is connected and cloning and what is the result when second display is not connected?
4. is there any /etc/X11/xorg.conf file (or on the paths listed here: http://manpages.ubuntu.com/manpages/precise/man5/xorg.conf.5.html ) and if yes, what is the content?

Edit2: the xrandr result should be OK, I see your LVDS as primary display and VGA-0 (should be) shifted 1280 pixels ríght and 200 pixels up, means lower corner if both monitors should be the same. There should be no reason why the part of second (VGA) monitor is displayed on your notebook display. Possible is the driver bug, but it is not clear if you have Ubuntu 13.04 as you wrote in the question or 13.10 as you wrote in a comment bellow. Please correct.