I am trying to setup dual monitors with a dual head radeon 7500. I had found an earlier posting about a person who set theirs up and basically copied their XF86Config file. When I first tried to run X it gave me the error that /usr/X11R6/lib/modules/drivers/radeon_drv.o could not be resolved, and yes it is there. Then just out of the blue I tried to start X and it started with the same XF86Config file showing the screen stretched over two monitors but everytime I moved the mouse off of one screen that screen would shut off and the other one would freeze. And now all of the sudden it is back to the error that the file could not be resolved. Here is my XF86Config file.

Redhat 9.0 Kernel 2.4.20-20.9 X Version XFree86 Version 4.3.0

# XFree86 4 configuration created by redhat-config-xfree86

Section "ServerLayout"
Identifier "Default Layout"
Option "Xinerama" "on"
Screen 0 "Apple" 0 0
Screen "LGE" rightof "Apple"
InputDevice "Mouse0" "CorePointer"
InputDevice "Keyboard0" "CoreKeyboard"
InputDevice "DevInputMice" "AlwaysCore"
EndSection

Section "Files"

# RgbPath is the location of the RGB database. Note, this is the name of the
# file minus the extension (like ".txt" or ".db"). There is normally
# no need to change the default.
# Multiple FontPath entries are allowed (they are concatenated together)
# By default, Red Hat 6.0 and later now use a font server independent of
# the X server to render fonts.
RgbPath "/usr/X11R6/lib/X11/rgb"
FontPath "unix/:7100"
EndSection

Section "Module"
Load "dbe"
Load "extmod"
Load "fbdevhw"
Load "glx"
Load "record"
Load "freetype"
Load "type1"
EndSection

Section "InputDevice"

# Specify which keyboard LEDs can be user-controlled (eg, with xset(1))
# Option "Xleds" "1 2 3"
# To disable the XKEYBOARD extension, uncomment XkbDisable.
# Option "XkbDisable"
# To customise the XKB settings to suit your keyboard, modify the
# lines below (which are the defaults). For example, for a non-U.S.
# keyboard, you will probably want to use:
# Option "XkbModel" "pc102"
# If you have a US Microsoft Natural keyboard, you can use:
# Option "XkbModel" "microsoft"
#
# Then to change the language, change the Layout setting.
# For example, a german layout can be obtained with:
# Option "XkbLayout" "de"
# or:
# Option "XkbLayout" "de"
# Option "XkbVariant" "nodeadkeys"
#

# If you'd like to switch the positions of your capslock and
# control keys, use:
# Option "XkbOptions" "ctrl:swapcaps"
# Or if you just want both to be control, use:
# Option "XkbOptions" "ctrl:nocaps"
#
Identifier "Keyboard0"
Driver "keyboard"
Option "XkbRules" "xfree86"
Option "XkbModel" "pc105"
Option "XkbLayout" "us"
EndSection

Section "InputDevice"
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "PS/2"
Option "Device" "/dev/psaux"
Option "ZAxisMapping" "4 5"
Option "Emulate3Buttons" "yes"
EndSection

Section "InputDevice"

# If the normal CorePointer mouse is not a USB mouse then
# this input device can be used in AlwaysCore mode to let you
# also use USB mice at the same time.
Identifier "DevInputMice"
Driver "mouse"
Option "Protocol" "IMPS/2"
Option "Device" "/dev/input/mice"
Option "ZAxisMapping" "4 5"
Option "Emulate3Buttons" "no"
EndSection

Section "Monitor"
Identifier "Monitor0"
VendorName "Monitor Vendor"
ModelName "G701NF"
DisplaySize 320 250
HorizSync 30.0 - 72.0
VertRefresh 50.0 - 160.0
Option "dpms"
EndSection

Section "Monitor"
Identifier "Monitor1"
VendorName "Monitor Vendor
ModelName "Visual Sensations"
DisplaySize 320 250
HorizSync 30.0 - 72.0
VertRefresh 50.0 - 160.0
Option "dpms"
EndSection

Section "Device"
Identifier "ATI Radeon 7500 Apple"
Driver "radeon"
VendorName "Videocard vendor"
BoardName "ATI Radeon 7500"
VideoRam 65536
EndSection

Section "Device"
Identifier "ATI Radeon 7500 LGE"
Driver "radeon"
VendorName "Videocard vendor"
BoardName "ATI Radeon 7500"
VideoRam 65536
EndSection

Section "Screen"
Identifier "Apple"
Device "ATI Radeon 7500 Apple"
Monitor "Monitor0"
DefaultDepth 24
SubSection "Display"
Depth 24
Modes "1024x768" "800x600" "640x480"
EndSubSection
EndSection

Section "Screen"
Identifier "LGE"
Device "ATI Radeon 7500 LGE"
Monitor "Monitor1"
DefaultDepth 24
SubSection "Display"
Depth 24
Modes "1024x768" "800x600" "640x480"
EndSubSection
EndSection

Section "DRI"
Group "Video"
Mode 0666
EndSection

More Specifically Symbol xf86SetDDCproperties in /usr/X11R6/lib/modules/drivers/radeon_drv.o is unresolved

I get a similar error with my GeForce card. I think the problem is that both devices are trying to use the same driver, but I don't know how to fix it.