tep 1. When you start your computer, at least at some stage of the start up
process each of the monitors should display some start up information. If this
does not happen then something is wrong with your hardware or wire
connections.
Step 2. After you loaded the Ubuntu you arrive to one of three possibilities.
a. You
have the single-screen workspace duplicated on both monitors.
b. You
have the single-screen workspace displayed on one monitor and the second
monitor is black.
c. You
have a two-monitor workspace.
The case "c" means you do not need these instructions.
In case "a" proceed to next step.
The case "b" means you need to download and install the driver for your
graphic card and Ubuntu (and possibly restart).
Step 3. Once you have two monitors displaying the same single-screen
workspace, you need to extend your workspace to the second monitor. For such
purpose you need to execute the following session.
konstantin@DesktopTwo:~$ xrandr
Screen 0: minimum 320 x 200, current 1600 x 1200,
maximum 3200 x 1200
DFP1 connected 1600x1200+0+0 (normal left inverted
right x axis y axis) 367mm x 275mm
1600x1200 60.0*+
1400x1050 60.0
1280x1024 75.0 60.0 60.0
1440x900 59.9
1280x960 60.0
1152x864 75.0 60.0
1280x768 59.9
1280x720 60.0
1024x768 75.0 60.0
800x600 75.0 60.3
720x480 60.0
640x480 75.0 60.0
640x400 75.1 59.9
512x384 60.0 74.9
400x300 75.0 60.7
320x240 75.6 60.0
320x200 75.5 60.1
DFP_EXTTMDS connected 1600x1200+0+0 (normal left
inverted right x axis y axis) 367mm x 275mm
1600x1200 60.0*+
1400x1050 60.0
1280x1024 75.0 60.0 60.0
1440x900 59.9
1280x960 60.0
1152x864 75.0 60.0
1280x768 59.9
1280x720 60.0
1024x768 75.0 60.0
800x600 75.0 60.3
720x480 60.0
640x480 75.0 60.0
640x400 75.1 59.9
512x384 60.0 74.9
400x300 75.0 60.7
320x240 75.6 60.0
320x200 75.5 60.1
konstantin@DesktopTwo:~$ xrandr --output DFP1
--off
konstantin@DesktopTwo:~$ xrandr --output DFP1 --auto
--right-of DFP_EXTTMDS
The first command "xrandr" displays the necessary information. You have to
modify your session accordingly. The second command "xrandr --output DFP1
--off" disables one of the monitors. It becomes black. The parameter DFP1
comes from the information displayed after the first statement. The third
command extends the first monitor's workspace to the second monitor. At this
stage the xrandr may complain. It may say that you exceeded the limitation on
the total workspace area and refuse to extend the workspace. If that happens
then you need to edit the xorg.conf file (located in /etc/X11 for my ubuntu
installation).
The following is my xorg.conf with added lines in bold. Note that the
"Virtual" field is the double area of the "Modes" field. Also, the contents of
the "Modes" field came from the above session.
Section "Monitor"
Identifier"Configured
Monitor"
EndSection
Section "Screen"
Identifier"Default
Screen"
Monitor"Configured
Monitor"
Device"Configured
Video Device"
DefaultDepth24
SubSection"Display"
Modes
"1600x1200"
Virtual
3200 1200
EndSubSection
EndSection
Section "Module"
Load"glx"
EndSection
Section "Device"
Identifier"Configured
Video Device"
Driver"fglrx"
EndSection
After modifying the file restart the computer and attempt the session again.
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