Take the contents below, put it in a new file named:
and start X again. If it works fine, it will work monitorless. On some video cards “vesa” does not work as the driver, on these you’ll need to replace it with the appropriate one, the list can be had by running
X -configure from virtual terminal without X running. Recently saw this on a nice new ATI video card, solved it using “ati” instead of “vesa”.
Section "Monitor" Identifier "Monitor0" EndSection Section "Device" Identifier "Device0" Driver "vesa" #Choose the driver used for this monitor EndSection Section "Screen" Identifier "Screen0" #Collapse Monitor and Device section to Screen section Device "Device0" Monitor "Monitor0" DefaultDepth 24 #Choose the depth (16||24) SubSection "Display" Depth 24 Modes "1024x768_75.00" #Choose the resolution EndSubSection EndSection