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PB !!! accelleration 3D impossible avec dual screen ???

Bonjour tout le monde

je me suis lancé dans la mise en place d'un dual screen avec bureau etendu avec une carte ATi, bon ca sa a marché !!!

le probleme c'est que maintenant impossible d'avoir l'acceleration 3D

par exemple lorsque que je tape glxgears j'obtient :

Error: couldn't get an RGB, Double-buffered visual

dés que je remet mon xorg.conf de base sa marche !!! mais plus de bureau etendu

je pense que l'on peut les faire fonctionner ensemble non???

je pense qu'il doit y avoir une erreur dans mon xorg.conf qui doit faire planter l'acceleration 3D

je vous post les parties incrimer lorsque je veux faire le dual screen :

Section "Device"
	Identifier	"ATI Technologies, Inc. R430 UM [Radeon X800 XL] (PCIe) 1"
	Driver		"fglrx"
	BusID		"PCI:5:0:0"
	Screen		0
	Option	"Mode"	"1440x900"
EndSection

Section "Device"
	Identifier	"ATI Technologies, Inc. R430 UM [Radeon X800 XL] (PCIe) 2"
	Driver		"fglrx"
	BusID		"PCI:5:0:0"
	Screen		1
	Option	"Mode"	"1024x768"
EndSection

Section "Monitor"
	Identifier	"Acer AL1916W"
	Option		"DPMS"
	HorizSync	30-100
	VertRefresh	50-160
EndSection

Section "Monitor"
    Identifier    "Generic Monitor"
    Option        "DPMS"
EndSection

Section "Screen"
	Identifier	"Default Screen"
	Device		"ATI Technologies, Inc. R430 UM [Radeon X800 XL] (PCIe) 1"
	Monitor		"Acer AL1916W"
	DefaultDepth	24
	SubSection "Display"
		Depth		1
		Modes		"1440x900" "1280x1024" "1280x960" "1152x864" "1024x768" "800x600" "640x480"
	EndSubSection
	SubSection "Display"
		Depth		4
		Modes		"1440x900" "1280x1024" "1280x960" "1152x864" "1024x768" "800x600" "640x480"
	EndSubSection
	SubSection "Display"
		Depth		8
		Modes		"1440x900" "1280x1024" "1280x960" "1152x864" "1024x768" "800x600" "640x480"
	EndSubSection
	SubSection "Display"
		Depth		15
		Modes		"1440x900" "1280x1024" "1280x960" "1152x864" "1024x768" "800x600" "640x480"
	EndSubSection
	SubSection "Display"
		Depth		16
		Modes		"1440x900" "1280x1024" "1280x960" "1152x864" "1024x768" "800x600" "640x480"
	EndSubSection
	SubSection "Display"
		Depth		24
		Modes		"1440x900" "1280x1024" "1280x960" "1152x864" "1024x768" "800x600" "640x480"
	EndSubSection
EndSection

Section "Screen"
	Identifier	"Generic Monitor"
	Device		"ATI Technologies, Inc. R430 UM [Radeon X800 XL] (PCIe) 2"
	Monitor		"Generic Monitor"
	DefaultDepth	24
	SubSection "Display"
		Depth		1
		Modes		"1440x900" "1280x1024" "1280x960" "1152x864" "1024x768" "800x600" "640x480"
	EndSubSection
	SubSection "Display"
		Depth		4
		Modes		"1440x900" "1280x1024" "1280x960" "1152x864" "1024x768" "800x600" "640x480"
	EndSubSection
	SubSection "Display"
		Depth		8
		Modes		"1440x900" "1280x1024" "1280x960" "1152x864" "1024x768" "800x600" "640x480"
	EndSubSection
	SubSection "Display"
		Depth		15
		Modes		"1440x900" "1280x1024" "1280x960" "1152x864" "1024x768" "800x600" "640x480"
	EndSubSection
	SubSection "Display"
		Depth		16
		Modes		"1440x900" "1280x1024" "1280x960" "1152x864" "1024x768" "800x600" "640x480"
	EndSubSection
	SubSection "Display"
		Depth		24
		Modes		"1440x900" "1280x1024" "1280x960" "1152x864" "1024x768" "800x600" "640x480"
	EndSubSection
EndSection

Section "ServerLayout"
	Identifier	"Default Layout"
	Option 		"Xinerama" 	"on"
	Option		"Clone"	"off"
	Screen	0	"Default Screen"
	Screen	1	"Generic Monitor" LeftOf "Default Screen"
	InputDevice	"Generic Keyboard"
	InputDevice	"Configured Mouse"
	InputDevice     "stylus" "SendCoreEvents"
	InputDevice     "cursor" "SendCoreEvents"
	InputDevice     "eraser" "SendCoreEvents"
EndSection

quelqu'un a-t-il une idée ???

merci d'avance