Examining the XF86Config File
Before you try to start an X11 session using your new XF86Config settings, open the file in your favorite text editor, making sure to disable line wrapping, and check the settings. Doing this is essential, especially for laptop users, in order to check the created settings, enable or disable some X server graphics chipset-specific options, enter the correct amount of video memory, and fine-tune monitor or display settings. For example, you can open the file (as the root operator) with the pico text editor like this:
# pico -w /etc/X11/XF86Config
This section highlights some additional information and options you can use in your XF86Config, and found in the example XF86Config.eg file under the /usr/X11R6/lib/X11 ...