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I just replaced my old 4:3 CRT with Widescreen LCD. It is CMV 938D. It is 1440x900 60Hz TFT connected via DVI. When xorg starts the display shuts down with ...
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  1. #1
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    widescreen TFT display (DVI)


    I just replaced my old 4:3 CRT with Widescreen LCD. It is CMV 938D. It is 1440x900 60Hz TFT connected via DVI. When xorg starts the display shuts down with "No signal" message. Using latest Ubuntu. The old config working with old CRT is

    Code:
    # nvidia-xconfig: X configuration file generated by nvidia-xconfig
    # nvidia-xconfig:  version 1.0  (buildmeister@builder3)  Mon May 15 13:23:42 PDT 2006
    
    Section "ServerLayout"
        Identifier     "Layout0"
        Screen      0  "Screen0"
        InputDevice    "Keyboard0" "CoreKeyboard"
        InputDevice    "Mouse0" "CorePointer"
    EndSection
    
    Section "Files"
        RgbPath         "/usr/X11R6/lib/X11/rgb"
    EndSection
    
    Section "Module"
        Load           "dbe"
        Load           "extmod"
        Load           "type1"
        Load           "freetype"
        Load           "glx"
    EndSection
    
    Section "InputDevice"
        # generated from default
        Identifier     "Mouse0"
        Driver         "mouse"
        Option         "Protocol" "auto"
        Option         "Device" "/dev/psaux"
        Option         "Emulate3Buttons" "no"
        Option         "ZAxisMapping" "4 5"
    EndSection
    
    Section "InputDevice"
        # generated from default
        Identifier     "Keyboard0"
        Driver         "kbd"
    EndSection
    
    Section "Monitor"
        Identifier     "Monitor0"
        VendorName     "Unknown"
        ModelName      "Unknown"
        HorizSync       30.0 - 110.0
        VertRefresh     50.0 - 150.0
        Option         "DPMS"
    EndSection
    
    Section "Device"
        Identifier     "Device0"
        Driver         "nvidia"
        VendorName     "NVIDIA Corporation"
    EndSection
    
    Section "Screen"
        Identifier     "Screen0"
        Device         "Device0"
        Monitor        "Monitor0"
        DefaultDepth    24
        SubSection     "Display"
            Depth       24
            Modes      "1600x1200" "1280x1024" "1024x768" "800x600" "640x480"
        EndSubSection
    EndSection
    Straightforward replacing of the modes does not help.

    2 questions:

    1. What do I need to change to start Xorg with this display?
    2. Windows can easily detect possible modes of all monitors, why linux can't?

  2. #2
    Linux Guru sdousley's Avatar
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    You will need to add a line to the "Screen" section of xorg that says:

    Code:
    Option		"UseDisplayDevice"	"DFP"
    (DFP = Digital Flat Panel or TFT)
    This will tell xorg to use the DVI output rather than the standard VGA output
    "I am not an alcoholic, alcoholics go to meetings"
    Registered Linux user = #372327

  3. #3
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    Did not work. What else?

  4. #4
    Linux Guru sdousley's Avatar
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    here's my xorg.conf:

    Code:
    Section "Module"
        SubSection  "extmod"
        EndSubSection
        Load        "freetype"
        Load       "glx"
    EndSection
    
    
    Section "Files"
        FontPath   "/usr/share/fonts/100dpi/"
        FontPath   "/usr/share/fonts/misc/"
        FontPath   "/usr/share/fonts/TTF/"
        FontPath   "/usr/share/fonts/Type1/"
        FontPath   "/usr/share/fonts/75dpi/"
        FontPath   "/usr/share/fonts/local/"
    EndSection
    
    
    Section "InputDevice"
        Identifier  "Keyboard1"
        Driver      "kbd"
        Option "AutoRepeat" "500 30"
        Option "XkbRules"   "xorg"
        Option "XkbModel"   "pc101"
        Option "XkbLayout"  "gb"
    EndSection
    
    Section "InputDevice"
        Identifier  "Mouse1"
        Driver      "mouse"
        Option "Protocol" "auto"
        Option "Device" "/dev/input/mice"
        Option "Buttons" "5"
        option "ZAxisMapping" "4 5"
    EndSection
    
    Section "Monitor"
        Identifier  "RelisysTE770"
        VendorName  "Relisys"
        ModelName   "TE770"
        Option "DPMS" "on"
        HorizSync   60-75
        VertRefresh 60-75
        DisplaySize 338 270
    EndSection
    
    Section "Device"
        Identifier  "Standard VGA"
        VendorName  "Unknown"
        BoardName   "Unknown"
        Driver     "vga"
    EndSection
    
    Section "Device"
        Identifier  "GraphicForceGF2MX400"
        Driver      "nvidia"
        VideoRam    131072
        Option "RenderAccel" "true"
        Option "AllowGLXWithComposite" "true"
        Option "UseDisplayDevice" "DFP"
    EndSection
    
    Section "Screen"
        Identifier  "Screen 1"
        Device      "GraphicForceGF2MX400"
        Monitor     "RelisysTE770"
        DefaultDepth 24
    
        Subsection "Display"
            Depth       8
            Modes       "1280x1024" "1024x768" "800x600" "640x480"
            ViewPort    0 0
        EndSubsection
        Subsection "Display"
            Depth       16
            Modes       "1440x900" "1280x1024" "1024x768" "800x600" "640x480"
            ViewPort    0 0
        EndSubsection
        Subsection "Display"
            Depth       24
            Modes       "1440x900" "1280x1024" "1024x768" "800x600" "640x480"
            ViewPort    0 0
        EndSubsection
    EndSection
    
    Section "ServerLayout"
        Identifier  "Simple Layout"
        Screen "Screen 1"
        InputDevice "Mouse1" "CorePointer"
        InputDevice "Keyboard1" "CoreKeyboard"
    EndSection
    
    
    Section "Extensions"
        Option "Composite" "Enable"
    EndSection
    Take a look thru and see if anything there helps.

    What graphics card do you use? That may also help since that option i *think* is an Nvidia option
    "I am not an alcoholic, alcoholics go to meetings"
    Registered Linux user = #372327

  5. #5
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    OK,
    Option "UseDisplayDevice" "DFP"
    must be in videocard not in display. Trying.

    Update:
    Thank you, it works now.

    BTW do you have any stability problems with RenderAccel enabled?

  6. #6
    Linux Guru sdousley's Avatar
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    in terms of X running, none at all!! Had my PC up for 45 days before reinstalling (not because X died, various minor niggly type issues). And dont think X died on me once, may have restarted a few times manually, but not noticed any issues with that enabled.
    "I am not an alcoholic, alcoholics go to meetings"
    Registered Linux user = #372327

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