Dual-head setup has separate desktops, crashes on gnome-display-properties

C

ceo

After some work, I managed to get Gnome to come up on both screens of a dual-head system, using the built-in Intel video and an older NVidia card. Problem is, instead of one contiguous desktop, I get two separate desktops. I can move the mouse pointer between them, but I can't drag windows over.

Also, when I try to run gnome-display-properties, X instantly crashes. The xorg logfile says:

Fatal server error:
Caught signal 11. Server aborting

Any ideas? My xorg.conf follows.

Code: 
# nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig:  version 1.0  (root@lagavulin)  Mon Feb 23 15:20:22 EST 2009

Section "ServerLayout"
    Identifier     "X.org Configured"
    Screen      0  "Left" 0 0
    Screen      1  "Right" RightOf "Left"
    InputDevice    "Mouse0" "CorePointer"
    InputDevice    "Keyboard0" "CoreKeyboard"
EndSection

Section "Files"
    RgbPath         "/usr/local/share/X11/rgb"
    ModulePath      "/usr/local/lib/xorg/modules"
    FontPath        "/usr/local/lib/X11/fonts/misc/"
    FontPath        "/usr/local/lib/X11/fonts/TTF/"
    FontPath        "/usr/local/lib/X11/fonts/OTF"
    FontPath        "/usr/local/lib/X11/fonts/Type1/"
    FontPath        "/usr/local/lib/X11/fonts/100dpi/"
    FontPath        "/usr/local/lib/X11/fonts/75dpi/"
EndSection

Section "Module"
    Load           "dbe"
    Load           "extmod"
    Load           "glx"
    Load           "record"
    Load           "xtrap"
    Load           "freetype"
    Load           "type1"
EndSection

Section "InputDevice"
    Identifier     "Keyboard0"
    Driver         "kbd"
EndSection

Section "InputDevice"
    Identifier     "Mouse0"
    Driver         "mouse"
    Option         "Protocol" "auto"
    Option         "Device" "/dev/sysmouse"
    Option         "ZAxisMapping" "4 5"
    Option         "YAxisMappint" "6 7"
    Option         "EmulateWheel" "true"
    Option         "EmulateWheelButton" "9"
EndSection

Section "Monitor"

	#DisplaySize	  340   270	# mm
 ### Comment all HorizSync and VertRefresh values to use DDC:
    Identifier     "Monitor0"
    VendorName     "ACR"
    ModelName      "V173"
#    HorizSync       30.0 - 83.0
#    VertRefresh     56.0 - 75.0
    Option         "DPMS"
EndSection

Section "Device"
    Identifier     "Card0"
    Driver         "nvidia"
    BusID       "PCI:3:1:0"	
EndSection

Section "Device"
        ### Available Driver options are:-
        ### Values: <i>: integer, <f>: float, <bool>: "True"/"False",
        ### <string>: "String", <freq>: "<f> Hz/kHz/MHz"
        ### [arg]: arg optional
        #Option     "NoAccel"                   # [<bool>]
        #Option     "SWcursor"                  # [<bool>]
        #Option     "ColorKey"                  # <i>
        #Option     "CacheLines"                # <i>
        #Option     "Dac6Bit"                   # [<bool>]
        #Option     "DRI"                       # [<bool>]
        #Option     "NoDDC"                     # [<bool>]
        #Option     "ShowCache"                 # [<bool>]
        #Option     "XvMCSurfaces"              # <i>
        #Option     "PageFlip"                  # [<bool>]
        Identifier  "Card1"
        Driver      "intel"
        VendorName  "Intel Corporation"
        BoardName   "82G33/G31 Express Integrated Graphics Controller"
        BusID       "PCI:0:2:0"
EndSection


Section "Screen"
    Identifier     "Left"
    Device         "Card1"
    Monitor        "Monitor0"
    SubSection     "Display"
        Viewport    0 0
    EndSubSection
    SubSection     "Display"
        Viewport    0 0
        Depth       4
    EndSubSection
    SubSection     "Display"
        Viewport    0 0
        Depth       8
    EndSubSection
    SubSection     "Display"
        Viewport    0 0
        Depth       15
    EndSubSection
    SubSection     "Display"
        Viewport    0 0
        Depth       16
    EndSubSection
    SubSection     "Display"
        Viewport    0 0
        Depth       24
    EndSubSection
EndSection

Section "Screen"
    Identifier     "Right"
    Device         "Card0"

    Monitor        "Monitor0"
    SubSection     "Display"
        Viewport    0 0
    EndSubSection
    SubSection     "Display"
        Viewport    0 0
        Depth       4
    EndSubSection
    SubSection     "Display"
        Viewport    0 0
        Depth       8
    EndSubSection
    SubSection     "Display"
        Viewport    0 0
        Depth       15
    EndSubSection
    SubSection     "Display"
        Viewport    0 0
        Depth       16
    EndSubSection
    SubSection     "Display"
        Viewport    0 0
        Depth       24
    EndSubSection
EndSection
 
For the first problem (not being able to drag windows), try adding this line to the ServerLayout section of your xorg.conf file:

Option "Xinerama" "on"

As for the second problem, that's either a bug in one of the video drivers or in the X server. Does it crash if you use the open source 'nv' driver instead of the 'nvidia' driver?

Adam
 
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