Risolto.Questo e' il mio xorg.conf 
Adesso funziona.Ottengo uno screen su due monitor.
Ottimo.
L'Errore?talmente stupido da non crederci.

Slack cercava il mouse su /dev/devmouse, Debian su 
/dev/psaux

Assurdo perdersi cosi' :-)


Section "Module"
    Load        "dbe"   # Double buffer extension
    SubSection  "extmod"
      Option    "omit xfree86-dga"   # don't initialise the DGA extension
    EndSubSection
    Load       "type1"
    Load       "freetype"
    Load       "glx"
    Load       "dri"
EndSection

Section "Files"
    RgbPath    "/usr/X11R6/lib/X11/rgb"
    FontPath   "/usr/X11R6/lib/X11/fonts/misc/"
    FontPath   "/usr/X11R6/lib/X11/fonts/TTF/"
    FontPath   "/usr/X11R6/lib/X11/fonts/Type1/"
    FontPath   "/usr/X11R6/lib/X11/fonts/CID/"
    FontPath   "/usr/X11R6/lib/X11/fonts/75dpi/"
    FontPath   "/usr/X11R6/lib/X11/fonts/100dpi/"
    FontPath   "/usr/X11R6/lib/X11/fonts/local/"
    FontPath   "/usr/X11R6/lib/X11/fonts/Speedo/"
    FontPath   "/usr/X11R6/lib/X11/fonts/cyrillic/"
EndSection

Section "InputDevice"
    Identifier  "Keyboard1"
    Driver      "kbd"
    Option "AutoRepeat" "500 30"
    Option "XkbRules"   "xorg"
    Option "XkbModel"   "dell101"
    Option "XkbLayout"  "us"
EndSection

Section "InputDevice"
    Identifier "Mouse1"
    Driver "mouse"
    Option "Protocol"    "IMPS/2"
    Option "Device"      "/dev/psaux"
    Option "ZaxisMapping" "4 5"
    Option "Emulate 3Buttons" "no"
EndSection

Section "Device"
 Identifier "radeon1"
 Driver "radeon"
 Busid "PCI:1:0:0"
 Screen 0
 EndSection
 
 Section "Device"
 Identifier "radeon2"
 Driver "radeon"
 Busid "PCI:1:0:0"
 Screen 1
 EndSection

Section "Monitor"
  Identifier "monitor1"
  VendorName "Generic"
  ModelName  "1024x768 @ 60 Hz"
  HorizSync 31.5-48.5
  VertRefresh 50-70
EndSection

Section "Screen"
 Identifier "screen 0"
 Device "radeon1"
 Monitor "monitor1"
 DefaultColorDepth 24
 
 Subsection "Display"
 Depth 24
 Modes "1024x768" 
 ViewPort 0 0
 EndSubsection
EndSection

Section "Screen"
 Identifier "screen 1"
 Device "radeon2"
 Monitor "monitor1"
 DefaultColorDepth 24

 
Subsection "Display"
 Depth 24
 Modes "1024x768" 
 ViewPort 0 0
 EndSubsection
EndSection

Section "ServerLayout"
 Identifier "layout1"
 InputDevice "Keyboard1" "CoreKeyboard"
 InputDevice "Mouse1" "CorePointer"
 Screen "screen 1" LeftOf "screen 0"
 Screen "screen 0"
 Option "xinerama"
EndSection
 




-- 
Andrea Modesto Rossi
Services Ariadne
Tel:+39 0382 408911


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