Ubuntu: How to set each workspace to a separate monitor

I have a brand-new t-500 Laptop with docking station, and a Samsung SyncMaster T220 connected to it. The OS is Ubuntu 8.04 LTS.

I would like to set up the workspaces, so that the right one would be shown at the external monitor, and the left one would be displayed on the laptop.

I have tried the advice given here - rearranging the displays at the screen configuration tool, but without success - the laptop screen just shows the upper left corner of the SyncMaster, and the screens just overlap again when I rerun the screen config tool (Called "Screen resolution" in my version).

Any help?

Udi

Answer

perhaps this is what you're looking for: http://ubuntuforums.org/showthread.php?t=826717

Basically, from that thread, I'd edit /etc/X11/xorg.conf, and modify the "Screen" section (add red text):

Section "Screen"
    Identifier "Default Screen"
    Monitor "lcddisp"
    Device "Configured Video Device"
    DefaultDepth 24

    SubSection "Display"
        Virtual 3120 1050
    EndSubSection
EndSection

3120 is the sum of both monitor's resolution width (1680 + 1280), 1050 is the max of the resolution's height (1050 > 800).

Restart X (Ctrl-Alt-Backspace), then go to System > Preferences > Screen Resolutions. From there, you can turn on/off one of your monitor, or turn on both cloned, or turn on both side by side (as in dragging windows from one to another).

The only downside to me is that my Intel 965 has a 3D buffer size of 2048x2048 so 3D Compiz looks weird if I have two monitors in side-by-side mode (3120px is way too big to fit on 2048px buffer).

Read that post for more detail.

Source :http://ubuntuforums.org/archive/index.php/t-888979.html