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sortie dvi sur ecran sony carte matrox

Bonsoir,
Apres m'etre embrouille avec toutes les aides sur le forum j'en viens a poser ma question directement.
J'ai  un ecran sony SDM-X52 avec entrees anlogique et digitale dont voici les caracteristiques:

http://www.superwarehouse.com/Sony_SDM-X52_15_LCD_Monitor/SDM-X52/p/118851

J'ai une carte matrox avec les sorties correspondantes. Je n'ai aucun porbleme avec la sortie analogique tout marche bien. Par contre je n'arrive pas a faire marcher la sortie digitale. Je precise que je les branche une a une (et pas en meme temps) de la sorte que si  je branche juste la sortie analogique ca marche. Si je ne branche que la sortie digitale j'ai un "out of range" pour l'ecran X11, le mode console fonctionnant bien.
Ce qui est "amusant c'est que meme en essayant la configuration pour le dvi ma sortie analogique marche bien voici mon Xorg: (veuillez m'excuser de son etat bordelique) J'ai mis les carateristiques pour la sortie dvi

# /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"
	FontPath	"/usr/share/fonts/X11/misc"
	# path to defoma fonts
	FontPath	"/var/lib/defoma/x-ttcidfont-conf.d/dirs/TrueType"
EndSection

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

Section "InputDevice"
	Identifier	"Generic Keyboard"
	Driver		"kbd"
	Option		"CoreKeyboard"
	Option		"XkbRules"	"xorg"
	Option		"XkbModel"	"pc105"
	Option		"XkbLayout"	"us"
	Option		"XkbOptions"	"lv3:ralt_switch"
EndSection

Section "InputDevice"
	Identifier	"Configured Mouse"
	Driver		"mouse"
	Option		"CorePointer"
	Option		"Device"		"/dev/input/mice"
	Option		"Protocol"		"ExplorerPS/2"
	Option		"ZAxisMapping"		"4 5"
EndSection

Section "InputDevice"
  Driver        "wacom"
  Identifier    "stylus"
  Option        "Device"        "/dev/wacom"          # Change to 
                                                      # /dev/input/event
                                                      # for USB
  Option        "Type"          "stylus"
  Option        "ForceDevice"   "ISDV4"               # Tablet PC ONLY
EndSection

Section "InputDevice"
  Driver        "wacom"
  Identifier    "eraser"
  Option        "Device"        "/dev/wacom"          # Change to 
                                                      # /dev/input/event
                                                      # for USB
  Option        "Type"          "eraser"
  Option        "ForceDevice"   "ISDV4"               # Tablet PC ONLY
EndSection

Section "InputDevice"
  Driver        "wacom"
  Identifier    "cursor"
  Option        "Device"        "/dev/wacom"          # Change to 
                                                      # /dev/input/event
                                                      # for USB
  Option        "Type"          "cursor"
  Option        "ForceDevice"   "ISDV4"               # Tablet PC ONLY
EndSection

Section "Device"
	Identifier	"Generic"
	Driver		"mga"
	BusID		"PCI:1:0:0"
	Option		"OldDmaInit"		"True"
	Option "DDCMode" "True"
	Screen 0
EndSection



Section "Monitor"
    Identifier		"Sony SDM-X52 Digital"
    HorizSync		28-49
    VertRefresh		60-60
    Option		"DPMS"
EndSection




Section "Screen"
	Identifier	"Default Screen"
	Device		"Generic"
	Monitor		"Sony SDM-X52 Digital"
	DefaultDepth	24
	SubSection "Display"
		Depth		1
		Modes		"1024x768_85.00" "1024x768" "800x600" "640x480"
	EndSubSection
	SubSection "Display"
		Depth		4
		Modes		"1024x768_85.00" "1024x768" "800x600" "640x480"
	EndSubSection
	SubSection "Display"
		Depth		8
		Modes		"1024x768_85.00" "1024x768" "800x600" "640x480"
	EndSubSection
	SubSection "Display"
		Depth		15
		Modes		"1024x768_85.00" "1024x768" "800x600" "640x480"
	EndSubSection
	SubSection "Display"
		Depth		16
		Modes		"1024x768_85.00" "1024x768" "800x600" "640x480"
	EndSubSection
	SubSection "Display"
		Depth		24
		Modes		"1024x768_85.00" "1024x768" "800x600" "640x480"
	EndSubSection
EndSection

Section "ServerLayout"
	Identifier	"Default Layout"
	Screen	0	"Default Screen"
	InputDevice	"Generic Keyboard"
	InputDevice	"Configured Mouse"
	InputDevice     "stylus" "SendCoreEvents"
	InputDevice     "cursor" "SendCoreEvents"
	InputDevice     "eraser" "SendCoreEvents"
EndSection

Section "DRI"
	Mode	0666
EndSection

Voila, j'espere que c'est comprehensible et merci pour votre aide.