This hp/compaq nc6000 laptop/notebook that has an ATI card:
$ sudo lspci|grep VGA
0000:01:00.0 VGA compatible controller: ATI Technologies Inc RV350 [Mobility Radeon 9600 M10]
I have two head monitors working with both the 'ati' and the closed source 'fglrx' drivers.
Here are the configuration files:
Before you start hacking around with your xorg.conf, save a copy somewhere safe.