no dri with dual head

[lihb <lihb@xxxxxxxxxxxxxxxxxx>]

I have a dell d600, with ati radeon 9000,
I setup dual head with the following xorg.conf:

#######################################################
# Xorg configuration created by system-config-display

Section "ServerLayout"
       Identifier     "Multihead layout"
       Screen      0  "Screen0" 0 0
       Screen      1  "Screen1" RightOf "Screen0"
       InputDevice    "Mouse0" "CorePointer"
       InputDevice    "Keyboard0" "CoreKeyboard"
       Option      "Xinerama" "off"
       Option      "Clone" "on"
EndSection

Section "Files"
       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"
       Load  "dri"
EndSection
Section "Monitor"
       Identifier   "Monitor0"
       VendorName   "Monitor Vendor"
       ModelName    "Dell 1400x1050 Laptop Display Panel"
       HorizSync    31.5 - 90.0
       VertRefresh  59.0 - 75.0
       Option      "dpms"
EndSection

Section "Monitor"
       Identifier   "Monitor1"
       VendorName   "Monitor Vendor"
       ModelName    "Monitor 1024x768"
       HorizSync    31.5 - 57.0
       VertRefresh  50.0 - 70.0
       Option      "dpms"
EndSection

Section "Device"
       Identifier  "Videocard0"
       Driver      "radeon"
       VendorName  "Videocard vendor"
       BoardName   "ATI Radeon Mobility M9"
       Option      "AGPMode" "4"
       Option      "EnablePageFlip" "true"
       Option      "MonitorLayout" "LVDS, TMDS"
       Option      "backingstore"
       BusID       "PCI:1:0:0"
       Screen      0
EndSection
Section "Device"
       Identifier  "Videocard1"
       Driver      "radeon"
       VendorName  "Videocard Vendor"
       BoardName   "ATI Radeon Mobility M9"
       Option      "AGPMode" "4"
       Option      "EnablePageFlip" "true"
       Option      "MonitorLayout" "LVDS, TMDS"
       Option      "backingstore"
       BusID       "PCI:1:0:0"
       Screen      1
EndSection

Section "Screen"
       Identifier "Screen0"
       Device     "Videocard0"
       Monitor    "Monitor0"
       DefaultDepth     24
       SubSection "Display"
               Viewport   0 0
               Depth     16
               Modes    "1400x1050" "1280x1024" "1024x768" "800x600" 
"640x480"
       EndSubSection
       SubSection "Display"
               Viewport   0 0
               Depth     24
               Modes    "1400x1050" "1280x1024" "1024x768" "800x600" 
"640x480"
       EndSubSection
EndSection

Section "Screen"
       Identifier "Screen1"
       Device     "Videocard1"
       Monitor    "Monitor1"
       DefaultDepth     16
       SubSection "Display"
               Viewport   0 0
               Depth     16
               Modes    "1024x768"
       EndSubSection
EndSection

Section "DRI"
       Group        0
       Mode         0666
EndSection
############################################################################

I found that the dri had been disable, even though I have Option  
"AGPMode" "4",
is there anywhere I could solve this problem? Or what should I check to 
clarified this problem?

AND, also I had try to use ATI fglrx driver, which have dri on dual-head 
mode,
but the output of 2nd-screen is a totaly mess, any icons, any details on 
the 2nd-screen are unreadable,
and when the mouse move on 2nd-screen, I just see a bunch of color 
pixels moving. 
The xorg.conf is configured by fglrxconfig.

Clone-mode on both driver do have dri, but too bad, I don't know how to 
let 1st-screen with 1400x1050
while 2nd-screen at 1024x768.

Thanks to any comment.

lihb@xxxxxxxxxxxxxxxxxx