6.2. Configuring gdm

6.2.1. Changes, Part 1

....... [servers] # These are the standard servers. You can add as many you want here # and they will always be started. Each line must start with a unique # number and that will be the display number of that server. Usually just # the 0 server is used. 0=Standard 1=Second .......

Here, you'll have only 0=Standard. For each additional X server you should add a definition, like here, for 1=Second.

6.2.2. Changes, Part 2

.............................. # Definition of the standard X server. [server-Standard] name=Standard server command=/usr/X11R6/bin/X0 :0 -deferglyphs 16 -ac vt7 flexible=true [server-Second] name=Second server command=/usr/X11R6/bin/X1 :1 -deferglyphs 16 -xf86config /etc/X11/XF86Config-4.[your card] vt9 flexible=true ..............................

And here, the exact definition of the command line for starting the X server, very similar to the definitions in /etc/X11/xdm/Xservers (the definition of [server-Second] is the additional one).

If you use a single XFree configuration file:

.............................. # Definition of the standard X server. [server-Standard] name=Standard server command=/usr/X11R6/bin/X0 :0 -layout first-Xserver -deferglyphs 16 -ac vt7 flexible=true [server-Second] name=Second server command=/usr/X11R6/bin/X1 :1 -layout second-Xserver -deferglyphs 16 vt9 flexible=true ..............................