xrandr PreferredMode is being ignored

[Duncanla]

I upgraded to Fedora 8 x86_64 and am setting up the radeon driver to use xrandr 1.2. It works great changing the settings dynamically by doing

xrandr --output VGA-0 --mode 1024x768 --left-of LVDS

however I want these settings every time I boot, so I edited my xorg.conf to do this. The VGA-0 screen is being positioned to the left of LVDS, however it is forcing both screen resolutions to 1024x768 which is the preferred resolution for the VGA-0 screen.

I want the resolution for LVDS to be 1680x1050. I have set the preferredmode parameters for both monitors and that is working correctly, however it seems that the preferred mode for the LVDS screen is being overridden or ignored.

My xorg.conf file is attached


Thanks for any help.