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dual screen qui ne marche pas...

Bonjour,
j'aimerai etendre mon bureau sur deux ecrans... pouvoir faire passer une fenetre d'un ecran a l'autre... comme sous windows... mais le soucis c'est que des que j'mets Xinerama en on, X bug, et cela devient tout gris... donc j'peux pas garder les drivers "fglrx" j'dois remettre "ati"... et lorsque je fais ca... l'dual screen fonctionne mais mon ecran externe reste en veille... meme si j'vois que j'peux passer une fenetre... sur l'autre ecran... (grace a l'apercu des bureau)... apres avoir "mangé" tous les sujets du forum à propos du dual screen, je poste mon xorg.conf ici... merci d'avance!!!!
p.s: j'suis sous dapper!!!

# /etc/X11/xorg.conf (xorg X Window System server configuration file)
#
# This file was generated by dexconf, the Debian X Configuration tool, using
# values from the debconf database.
#
# Edit this file with caution, and see the /etc/X11/xorg.conf manual page.
# (Type "man /etc/X11/xorg.conf" at the shell prompt.)
#
# This file is automatically updated on xserver-xorg package upgrades *only*
# if it has not been modified since the last upgrade of the xserver-xorg
# package.
#
# If you have edited this file but would like it to be automatically updated
# again, run the following command:
#   sudo dpkg-reconfigure -phigh xserver-xorg

Section "Files"
	FontPath	"/usr/share/X11/fonts/misc"
	FontPath	"/usr/share/X11/fonts/cyrillic"
	FontPath	"/usr/share/X11/fonts/100dpi/:unscaled"
	FontPath	"/usr/share/X11/fonts/75dpi/:unscaled"
	FontPath	"/usr/share/X11/fonts/Type1"
	FontPath	"/usr/share/X11/fonts/100dpi"
	FontPath	"/usr/share/X11/fonts/75dpi"
	# path to defoma fonts
	FontPath	"/var/lib/defoma/x-ttcidfont-conf.d/dirs/TrueType"
	FontPath    	"/var/lib/defoma/x-ttcidfont-conf.d/dirs/CID"
EndSection

Section "Module"
	Load	"i2c"
	Load	"bitmap"
	Load	"ddc"
	Load	"dri"
	Load	"extmod"
	Load	"freetype"
	Load	"glx"
	Load	"int10"
	Load	"type1"
	Load	"vbe"
    Load    "GLcore"
EndSection

Section "InputDevice"
	Identifier	"Generic Keyboard"
	Driver		"kbd"
	Option		"CoreKeyboard"
	Option		"XkbRules"	"xorg"
	Option		"XkbModel"	"pc105"
	Option		"XkbLayout"	"fr"
	Option		"XkbVariant"	"latin9"
EndSection

Section "InputDevice"
	Identifier	"Configured Mouse"
	Driver		"mouse"
	Option		"CorePointer"
	Option		"Device"		"/dev/input/mice"
	Option		"Protocol"		"ExplorerPS/2"
	Option		"Emulate3Buttons"	"true"
EndSection

Section "InputDevice"
	Identifier	"Synaptics Touchpad"
	Driver		"synaptics"
	Option		"SendCoreEvents"	"true"
	Option		"Device"		"/dev/psaux"
	Option		"Protocol"		"auto-dev"
	Option		"HorizScrollDelta"	"0"
EndSection

Section "Device"
	Identifier	"ATI Technologies, Inc. M24 1T [FireGL M24 GL]"
	Driver		"ati"
	BusID		"PCI:1:0:0"
       Screen        0
EndSection

Section "Device"
	Identifier	"ATI Technologies, Inc. M24 1T [FireGL M24 GL]2"
	Driver		"ati"
	Screen		1
	BusID		"PCI:1:0:0"
EndSection

Section "Monitor"
	Identifier	"Écran générique"
	Option		"DPMS"
EndSection

Section "Monitor"
	Identifier	"Écran etendu"
	Option		"DPMS"
EndSection

Section "Screen"
	Identifier	"Default Screen"
	Device		"ATI Technologies, Inc. M24 1T [FireGL M24 GL]"
	Monitor		"Écran générique"
	DefaultDepth	24
	SubSection "Display"
		Depth		1
		Modes		"1600x1200"
	EndSubSection
	SubSection "Display"
		Depth		4
		Modes		"1600x1200"
	EndSubSection
	SubSection "Display"
		Depth		8
		Modes		"1600x1200"
	EndSubSection
	SubSection "Display"
		Depth		15
		Modes		"1600x1200"
	EndSubSection
	SubSection "Display"
		Depth		16
		Modes		"1600x1200"
	EndSubSection
	SubSection "Display"
		Depth		24
		Modes		"1600x1200"
	EndSubSection
EndSection

Section "Screen"
        Identifier      "Second Screen"
        Device          "ATI Technologies, Inc. M24 1T [FireGL M24 GL]2"
        Monitor         "Écran etendu"
        DefaultDepth    24
        SubSection "Display"
                Depth           24
                Modes           "1280x1024"
        EndSubSection
EndSection

#Sauvegarde
#Section "ServerLayout"
#	Identifier	"Default Layout"
#	Screen		"Default Screen"
#	InputDevice	"Generic Keyboard"
#	InputDevice	"Configured Mouse"
#	InputDevice	"Synaptics Touchpad"
#EndSection


Section "ServerLayout"
    Identifier    "Default Layout"
    Option        "Clone"    "off"
    Option        "Xinerama" "on"
    Screen        0    "Default Screen"
    Screen        1    "Second Screen" RightOf "Default Screen"

    InputDevice   "Generic Keyboard"
    InputDevice   "Configured Mouse"
    InputDevice    "Synaptics Touchpad"
EndSection

Section "DRI"
	Mode	0666
EndSection