Two physical displays with Linux

hello i am trying to create two physical displays in linux which is as "Virtual Desktop". i need help to do this , is there any operation require to create such display ? please direct me to do such change . thank you

yes yo can do this with Xinerama . Xinerama is an extension to the X Window System which enables multi-headed X applications and window managers to use two or more physical displays as one large virtual display.
read more here
http://en.wikipedia.org/wiki/Xinerama

hi for configuration and setup check this link
http://www.faqs.org/docs/Linux-HOWTO...ama-HOWTO.html

With SAX2 (Linux 7.2) it is easy to configure a single screen - however, having two screens on one machine and (in the following example) on one graphics card, is not so easy.


First: software
- SuSE Linux 7.2
- XFree86 Version 4.0.3
- KDE 2.1.2

If you have two screens connected to your PC, with e.g. a Matrox G450 DH card, you should first setup things with one screen only. Then use SAX2 and add an additional graphics card (also you have only one, but with two outlets such as the G450) and also define the second monitor and define the color and resolution stuff. However, any attempt to *test* the settings never worked on my system.
Instead, I recommend, then to edit the file /etc/X11/XF86Config (as root) and to set it up similar to the one I include below.
Please note, that since I have two identical monitors, it would not be necessary to define the second one. However, I have just copied the 'modelines' stuff from the first to the second moitor to the "Section Modes" .
Important is also, that you give the BusID from your graphics card - SAX2 did in my case just say something like 'Single'. I did then use (as root) the command 'lspci' , which showed me the BusID of the graphics card:
01:00.0 VGA compatible controller: Matrox Graphics, Inc. MGA G400 AGP (rev 82)
So, I added the following line to the file XF86Config in the 'Section Device':
BusID "PCI:01:00:0"
Please note, that it was necessary to include a colon ':' between the word 'PCI' and the '01' - this is different from what is displayed in the book 'Reference' from SuSE !
Below I include my new file XF86Config - configured for xinerama, which I prefer to the non-xinerama version, where you have to explicitly define the new display for each window, by defining export DISPLAY=:0.1 before you start a new window on the second screen. You may activate xinerama simply by adding a line as described below under the "ServerLayout" Section at the line
Option "Xinerama" "on"