Hi,
I'm reading the man page for XF86Config to try to come up with a
solution. I see in there an option called 'Virtual <xdim> <ydim>' that
looks like it would be in the Screen Configuration section. Do you have
any line in you're XF86Config-4 file that has 'Virtual' on it? If so it
is probably what is causing your viurtual desktop to occur. It may be
helpful if you were to post your /etc/X11/XF86Config-4 file for
troubleshooting purposes.
HTH,
Jim
