[ltp] T40p FC6 twin-head woes

[Phil]

Hi all
I'm new to this list, hope someone can point me in the right direction...

I've recently installed Fedora Core 6 on my T40p having finally got so 
fed up with Windows slowdowns etc. Mostly the install was a breeze, but 
I've got a major problem that I can't fix despite much web searching and 
trial and error,  inability to configure for dual screens. If I can't 
get this to work I'll have to go back to Windows because I need to do 
presentations etc.

I'm running kernel  2.6.18-1.2868.fc6 with a pretty stock installation. 
lspci gives me:
  VGA compatible controller: ATI Technologies Inc Radeon R250 [Mobility 
FireGL 9000] (rev 02)

I'm using the standard radeon driver, and my xorg.conf is listed at the 
foot of this mail.
When I try configuring dual-head through the standard Display admintool 
the external monitor shows a connection but the screen is completely 
blank. The workspace switcher shows a wide screen and I can move windows 
off the LCD into the external monitor area but they're invisible.

After doing some hunting I decided to try the fglrx driver from livna - 
but using this in twin-head mode hangs my system completely.
I've tried all sorts of things suggested by others but cannot get both 
LCD and external running together. Either the system hangs when X comes 
up, or LCD or external is blank. If I boot connected to external I can 
run on that but the LCD is blank. I very briefly had this working after 
a fashion on FC5 but I've no idea how! I really really don't want to go 
back to Windoze but will have to if I can't get dual head working.

Hope someone can advise!
Thanks
Phil

# Xorg configuration created by system-config-display

Section "ServerLayout"
        Identifier     "single head configuration"
        Screen      0  "Screen0" 0 0
        InputDevice    "Keyboard0" "CoreKeyboard"
EndSection

Section "ServerFlags"
        Option      "AllowMouseOpenFail" "yes"
EndSection

Section "InputDevice"
        Identifier  "Keyboard0"
        Driver      "kbd"
        Option      "XkbModel" "pc105"
        Option      "XkbLayout" "gb"
EndSection

Section "Monitor"
        Identifier   "Monitor0"
        ModelName    "LCD Panel 1400x1050"
 ### Comment all HorizSync and VertSync values to use DDC:
        HorizSync    31.5 - 90.0
        VertRefresh  59.0 - 75.0
        Option      "dpms"
EndSection

Section "Device"
        Identifier  "Videocard0"
        Driver      "radeon"
EndSection

Section "Screen"
        Identifier "Screen0"
        Device     "Videocard0"
        Monitor    "Monitor0"
        DefaultDepth     24
        SubSection "Display"
                Viewport   0 0
                Depth     24
                Modes    "1400x1050" "1280x1024" "1280x960" "1280x800" 
"1152x864" "1024x768" "800x600" "640x480"
        EndSubSection
EndSection