Video resolution problem on Dell C600 notebook

[Kevin Meyer]

Hi,
I've loaded lucid lynx on an old Dell C600 notebook.  Through the GUI  
config utility the max video res showing is 800x600.  The screen is  
much more capable than that.  I checked the Ubuntu blogs and there are  
instructions on how to fix this.  One in particular involves editing  
the xorg.conf file.  However, my machine doesn't have a xorg.conf file  
in the etc/X11 directory.  I tried running sudo xorg -configure but I  
get a fatal server error saying that server is already active for  
display 0.  How can I get out of this mess?  Can you help me to  
understand how xorg works better so I can fix this?  Thanks.

I have all the needed info on the the ATI Mobility M3 chipset and the  
screen resolutions.
Regards,
Kevin