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Sortie télé sur carte ATI Radeon 9250

Salut,

Je suis sous Ubuntu Edgy. J'ai acheté une carte Sapphire Radeon 9250 PCI 128 DDR dont j'aimerais utiliser la sortie télé. Après avoir suivi plusieurs infos sur les forums anglais et français, je suis un peu perdu. La carte fonctionne bien avec mon écran LCD (sortie VGA) mais rien s'affiche sur ma TV.

Voici mon xorg.conf:

# /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    "dbe"
        Load    "ddc"
        Load    "dri"
        Load    "extmod"
        Load    "freetype"
        Load    "glx"
        Load    "int10"
        Load    "record"
        Load    "type1"
        Load    "v4l"
        Load    "vbe"
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          "ZAxisMapping"          "4 5"
        Option          "Emulate3Buttons"       "true"
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      "Carte vid�o g�n�rique"
        Driver          "radeon"
        BusID           "PCI:0:20:0"
EndSection

Section "Monitor"
        Identifier      "NEC LCD1760N"
        Option          "DPMS"
        HorizSync       30-70
        VertRefresh     50-160
EndSection

Section "Screen"
        Identifier      "Default Screen"
        Device          "Carte vid�o g�n�rique"
        Monitor         "NEC LCD1760N"
        DefaultDepth    24
        SubSection "Display"
                Depth           1
                Modes           "1280x1024" "1152x864" "1024x768" "800x600" "640
x480"
        EndSubSection
        SubSection "Display"
                Depth           4
                Modes           "1280x1024" "1152x864" "1024x768" "800x600" "640
x480"
        EndSubSection
        SubSection "Display"
                Depth           8
                Modes           "1280x1024" "1152x864" "1024x768" "800x600" "640
x480"
        EndSubSection
        SubSection "Display"
                Depth           15
                Modes           "1280x1024" "1152x864" "1024x768" "800x600" "640
x480"
        EndSubSection
        SubSection "Display"
                Depth           16
                Modes           "1280x1024" "1152x864" "1024x768" "800x600" "640
x480"
        EndSubSection
        SubSection "Display"
                Depth           24
                Modes           "1280x1024" "1152x864" "1024x768" "800x600" "640
x480"
        EndSubSection
EndSection

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

Section "DRI"
        Mode    0666
EndSection

J'utilise les drivers libres (radeon) et non les drivers propriétaire (fglrx) car ils fonctionnent mieux et car je ne suis pas intéressé par la 3D. J'ai essayé différentes options de aticonfig et atittvout mais sans succès.

Merci d'avance

Cyril