Dual Monitor For Presentation in Ubuntu

Hello All,

Recently, I installed Ubuntu to replace my previous Windows XP Home Edition. Soon after installing it, I realized that in Linux you will not get everything automatically. For example , dual-screen monitor. This facility is very important to me, because I use it to teach everyday.
I searched in google, in ubuntu forums, etc... and I finally found that we can make a dual screen monitor using xrandr utility. This utility is not automatically installed. You need to find it in package using synaptic or apt-search.try looking for "xrandr",install it.
xrandr will sense whether your external output connected or not. just run "xrandr", and you will know.


In my experience, my laptop monitor is detected as LVDS, and if I connect either External Monitor or LCD monitor, it will be detected as VGA. so, after connecting external output, you will get two outputs, that is LVDS and VGA
First, you need to set the resolution you need to show your current display to external output. The resolution will depend on the hardware characteristic. Before you deal with these commands, you should edit your /etc/X11/xorg.conf first, please find "Display" SubSection and find Modes keyword, you should set the resolution to twice larger than your current LVDS resolution. If you use 1280x800 resolution, you have to change it to 2560 1600.change the Modes keyword to Virtual keyword.
Maybe this will help you

Section "Screen"
Identifier "screen0"
Device "Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller"
Monitor "Generic Monitor"
DefaultDepth 24
SubSection "Display"
Depth 24
Virtual 2560 1600
EndSubSection
EndSection

When you finished, save it,and restart your X by pressing control-alt-backspace, login back to your screen. afterward, open your terminal and type the following command.

xrandr --output VGA --mode 800x600

The command is used to show your current display to external output with resolution 800x600.After doing this, there might be a weird thing to your current display. yes, gnome (if you use it) will resize its panel to such resolution. That will happen if your current LVDS resolution doesn't match the external output resolution. anyway that is oke, don't worry.

We can also treat your external and current output as single screen by doing this :

xrandr --output VGA --right-of LVDS

that command will enlarge your screen to double your current resolution. with such command, you can move your mouse across the screen.But there is a weird thing too, because the gnome panel will be displayed in external output.however if you run program from gnome panel, the program will be displayed in your current LVDS screen. It's inconvenient, isn't it ? Why ?? I don't know, I'm still looking for the answer right now. Someone in mailing list told me that It is the bug of gnome. Anyway, it doesn't matter, I can still use that feature even though you have to get accustomed with that.




Thank God it works

NB:
To shut off your external display, type this command
xrandr --output VGA --off

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