gistfile1.txt

[   419.407] 0: /usr/bin/X (xorg_backtrace+0x26) [0x460576]
[   419.407] 1: /usr/bin/X (0x400000+0x64b8a) [0x464b8a]
[   419.407] 2: /lib/x86_64-linux-gnu/libpthread.so.0 (0x7f196172e000+0x10060) [0x7f196173e060]
[   419.407] 3: /usr/bin/X (RRFirstOutput+0x5b) [0x4c336b]
[   419.407] 4: /usr/bin/X (ProcRRGetScreenInfo+0x108) [0x4cc658]
[   419.407] 5: /usr/bin/X (0x400000+0x2fb89) [0x42fb89]
[   419.407] 6: /usr/bin/X (0x400000+0x232fe) [0x4232fe]
[   419.407] 7: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xed) [0x7f196066a30d]
[   419.407] 8: /usr/bin/X (0x400000+0x235ed) [0x4235ed]
[   419.407] Segmentation fault at address 0xa0
[   419.407] 
Caught signal 11 (Segmentation fault). Server aborting

xorg.conf

Section "Files"
     ModulePath      "/usr/lib/xorg/modules"
     ModulePath      "/usr/local/lib/xorg/modules"
     ModulePath	"/usr/local/lib/xorg/modules/drivers"
EndSection

#### ORIGINAL ########
Section "Monitor"
    Identifier     "Monitor0"
    VendorName     "Unknown"
    ModelName      "Ancor Communications Inc ASUS VH242H"
    HorizSync       30.0 - 85.0
    VertRefresh     55.0 - 75.0
    Option         "DPMS"
EndSection

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "GeForce GTS 250"
EndSection

Section "Screen"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    Option         "TwinView" "1"
    Option         "metamodes" "DFP-0: nvidia-auto-select +0+0, DFP-1: nvidia-auto-select +1920+0"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection



############### DisplayLink Stuff ###############

Section "Device"
        Identifier      "DisplayLinkDevice"
        driver          "displaylink"
        Option  "fbdev" "/dev/fb0"
EndSection

Section "Monitor"
        Identifier      "DisplayLinkMonitor"
EndSection

Section "Screen"
        Identifier      "DisplayLinkScreen"
	Device          "DisplayLinkDevice"
        Monitor         "DisplayLinkMonitor"
        SubSection "Display"
                Depth   16
		Modes   "1280x1024"
        EndSubSection
EndSection


### NEW LAYOUT
Section "ServerLayout"
        Identifier      "Server Layout"
        Screen  0       "DisplayLinkScreen" 0 0
        Screen  1       "Screen0" LeftOf "DisplayLinkScreen"
        Option          "Xinerama" "off"
EndSection