[K12OSN] dual display

[Steve Gilmore]

Good Day,
I'm trying to implement dual monitors for the server only 
(k12ltsp-v6.0-x64). Installed an ATI 9250 and setup spanning, but am only 
getting a cloned display. I had to add 'iommu=noaperture' to the kernel boot 
line due to memaper aperture error.
I rechecked manually the /etc/X11/xorg.conf and setup monitors and video 
card for Xinerama, but still am only getting a cloned display.
Is there another config file that has to be edited to enable a spanned 
desktop for the server only, not the client displays?
SteveG