Deine Konfig finde ich etwas zur unЭbersichtlich. Vieleicht hilft dir ja meine. Schau 
sie dir einfach mal an.

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



Section "Files"
        FontPath        "unix/:7100"                    # local font server
        # if the local font server has problems, we can fall back on these
        FontPath        "/usr/lib/X11/fonts/misc"
        FontPath        "/usr/lib/X11/fonts/cyrillic"
        FontPath        "/usr/lib/X11/fonts/100dpi/:unscaled"
        FontPath        "/usr/lib/X11/fonts/75dpi/:unscaled"
        FontPath        "/usr/lib/X11/fonts/Type1"
        FontPath        "/usr/lib/X11/fonts/Speedo"
        FontPath        "/usr/lib/X11/fonts/100dpi"
        FontPath        "/usr/lib/X11/fonts/75dpi"
EndSection

Section "Module"
        Load    "GLcore"
        Load    "bitmap"
        Load    "dbe"
        Load    "ddc"
        Load    "dri"
        Load    "extmod"
        Load    "freetype"
        Load    "glx"
        Load    "int10"
        Load    "pex5"
        Load    "record"
        Load    "speedo"
        Load    "type1"
        Load    "vbe"
        Load    "xie"
EndSection



Section "ServerFlags"
  Option "Xinerama" "true"
EndSection

Section "InputDevice"
        Identifier      "Generic Keyboard"
        Driver          "keyboard"
        Option          "CoreKeyboard"
        Option          "XkbRules"      "xfree86"
        Option          "XkbModel"      "pc104"
        Option          "XkbLayout"     "de"
EndSection

Section "InputDevice"
        Identifier      "Configured Mouse"
        Driver          "mouse"
        Option          "CorePointer"
        Option          "Device"                "/dev/psaux"
        Option          "Protocol"              "ImPS/2"
        Option          "Emulate3Buttons"       "true"
        Option          "ZAxisMapping"          "4 5"
EndSection

Section "InputDevice"
        Identifier      "Generic Mouse"
        Driver          "mouse"
        Option          "SendCoreEvents"        "true"
        Option          "Device"                "/dev/input/mice"
        Option          "Protocol"              "ImPS/2"
        Option          "Emulate3Buttons"       "true"
        Option          "ZAxisMapping"          "4 5"
EndSection

Section "Device"
        Identifier      "NvidiaOnbord"
        Driver          "nvidia"
        BusID           "PCI:02:00:0"
#        Screen           0
EndSection

Section "Device"
        Identifier      "PCI-Karte"
        Driver          "nv"
        BusID           "PCI:01:08:0"
#        Screen           1
EndSection


Section "Monitor"
        Identifier      "Samtron"
        HorizSync       30-130
        VertRefresh     60-160
        Option          "DPMS"
EndSection

Section "Monitor"
    Identifier  "LCD-Hercules"
#    HorizSync   31.5 - 82.0
    HorizSync 31.5-60
    VertRefresh 50-60
EndSection

Section "Screen"
        Identifier      "Screen0"
        Device          "NvidiaOnbord"
        Monitor         "Samtron"
        DefaultDepth    24
        SubSection "Display"
                Depth           1
                Modes           "1152x864"
        EndSubSection
        SubSection "Display"
                Depth           4
                Modes           "1152x864"
        EndSubSection
        SubSection "Display"
                Depth           8
                Modes           "1152x864"
        EndSubSection
        SubSection "Display"
                Depth           15
                Modes           "1152x864"
        EndSubSection
        SubSection "Display"
                Depth           16
                Modes           "1152x864"
        EndSubSection
        SubSection "Display"
                Depth           24
                Modes           "1152x864"
        EndSubSection
EndSection


Section "Screen"
        Identifier      "Screen1"
        Device          "PCI-Karte"
        Monitor         "LCD-Hercules"
        DefaultDepth    24
        SubSection "Display"
                Depth           1
                Modes           "1280x1024"
        EndSubSection
        SubSection "Display"
                Depth           4
                Modes           "1152x864"
        EndSubSection
        SubSection "Display"
                Depth           8
                Modes           "1152x864"
        EndSubSection
        SubSection "Display"
                Depth           15
                Modes           "1152x864"
        EndSubSection
        SubSection "Display"
                Depth           16
                Modes           "1152x864"
        EndSubSection
        SubSection "Display"
                Depth           24
                Modes           "1280x1024"
        EndSubSection
EndSection

 Section "ServerLayout"
        Identifier "ZweiGrafikkarten"
         Option      "Xinerama"
         Screen      "Screen0"
         Screen      "Screen1" RightOf "Screen0"
#          Screen      "Screen1"
#          Screen      "Screen0"
         InputDevice "Generic Keyboard"
         InputDevice "Configured Mouse"
 EndSection



Die kannst du eingentlich so Эbernehmen, nur die entsprДchenden PCI-Adressen durch 
deine ersetzen.

Viel Erfolg
Vlad


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