I'm trying to get 4 displays working with one workstation but I'm facing issues to properly setup one screen across all displays. One of the displays is always panning with the mouse being moved to second screen (see picture). Is there some option in xorg.conf to prevent such behavior? Current setup works with xinerama enabled with either onboard intel + pci radeon or onboard intel + pci nvidia (nouveau driver) and in both cases the screen is panning (so it is not some issue with gfx driver).

/etc/X11/xorg.conf

Section "Monitor"
    Identifier   "nvmonitor1"
    Option "PreferredMode" "1280x1024_60.00"
    #Option "Position"  "0 1024"
    # Option    "RightOf" "intelmonitor2"
EndSection

Section "Monitor"
    Identifier   "nvmonitor2"
    Option "PreferredMode" "1280x1024_60.00"
    #Option "Position"  "1280 1024"
    # Option "RightOf" "nvmonitor1"
EndSection

Section "Monitor"
    Identifier  "intelmonitor1"
    Option "PreferredMode" "1280x1024_60.00"
    #Option "Position" "0 0"
    #Option "LeftOf" "nvmonitor2"
EndSection

Section "Monitor"
    Identifier   "intelmonitor2"
    Option "PreferredMode" "1280x1024_60.00"
    #Option "Position" "1280 0"
    #Option "RightOf" "intelmonitor1"
EndSection



Section "Device"
    Identifier  "nvidia1"
    Driver  "nouveau"
    BusID   "PCI:1:10:0"
    Option  "Monitor-VGA-2" "nvmonitor1"
    Option  "Monitor-VGA-3" "nvmonitor2"
    Option  "ZaphodHeads"   "VGA-2,VGA-3"
EndSection

Section "Device"
    Identifier  "intelonboard"
    Driver  "intel"
    BusID   "PCI:0:2:0"
    Option  "Monitor-VGA1"  "intelmonitor1"
    Option  "Monitor-HDMI2" "intelmonitor2"
    Option  "ZaphodHeads"   "VGA1,HDMI2"
EndSection



Section "Screen"
    Identifier "nv1screen"
    Monitor "nvmonitor1"
    DefaultDepth 24
      SubSection "Display"
       Depth      24
      #Virtual 2560 2048
      EndSubSection
    Device "nvidia1"
EndSection

Section "Screen"
    Identifier "nv1screen2"
    Monitor "nvmonitor2"
    DefaultDepth 24
      SubSection "Display"
       Depth      24
      #Virtual 2560 2048
      EndSubSection
    Device "nvidia1"
EndSection

Section "Screen"
    Identifier "intelscreen"
    Monitor "intelmonitor1"
    DefaultDepth 24
      SubSection "Display"
       Depth     24
      #Virtual 2560 2048
      EndSubSection
    Device "intelonboard"
EndSection

Section "Screen"
    Identifier "intelscreen2"
    Monitor "intelmonitor2"
    DefaultDepth 24
      SubSection "Display"
       Depth     16
      #Virtual 2560 2048
      EndSubSection
    Device "intelonboard"
EndSection


# Server layout (4x1 displays)
Section "ServerLayout"
    Identifier "layout1"
    Screen  0   "intelscreen"   0 0
    Screen  1   "intelscreen2"  RightOf "intelscreen"
    Screen  2   "nv1screen"     RightOf "intelscreen"
    Screen  3   "nv1screen2"    RightOf "nv1screen2"
    Option  "Xinerama"  "On"
    Option  "Clone"     "Off"
EndSection