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I have a DELL precision workstation 470. It has a nVIDIA Quadro FX 1400, 128 Mb dual VGA or DVI card and a Redhat Enterprise Linux WS 4 installed. I have two DELL 1704FPT monitors and they are connected to this single video card. When the computer starts, I can see the startup information on both monitors until it enters X window startup, when one monitor cease to function. The other one works normally. I tried to change the display settings. I could select "dual head" option, but there was no associated video card and I couldn't manually select anything.
What's wrong with the system? Do I have to change the configuration for X window? One video card seems ok, right?
Thanks a lot.
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If possible, can you send us a picture of your display setup? It will be nice to see dual heads.
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Sure. Here is my xorg.conf:
If you want to have two independent X screen, delete "Option "Xinerama" "on".
Have fun.
*******
# Xorg configuration created by system-config-display
Section "ServerLayout"
Identifier "multiple head configuration"
Screen 0 "Screen0" 0 0
Screen 1 "Screen1" LeftOf "Screen0"
InputDevice "Mouse0" "CorePointer"
InputDevice "Keyboard0" "CoreKeyboard"
Option "Xinerama" "on"
EndSection
Section "Files"
# RgbPath is the location of the RGB database. Note, this is the name of the
# file minus the extension (like ".txt" or ".db"). There is normally
# no need to change the default.
# Multiple FontPath entries are allowed (they are concatenated together)
# By default, Red Hat 6.0 and later now use a font server independent of
# the X server to render fonts.
RgbPath "/usr/X11R6/lib/X11/rgb"
FontPath "unix/:7100"
EndSection
Section "Module"
Load "dbe"
Load "extmod"
Load "fbdevhw"
Load "glx"
Load "record"
Load "freetype"
Load "type1"
Load "dri"
EndSection
Section "ServerFlags"
Option "AllowMouseOpenFail" "yes"
EndSection
Section "InputDevice"
# Specify which keyboard LEDs can be user-controlled (eg, with xset(1))
# Option "Xleds" "1 2 3"
# To disable the XKEYBOARD extension, uncomment XkbDisable.
# Option "XkbDisable"
# To customise the XKB settings to suit your keyboard, modify the
# lines below (which are the defaults). For example, for a non-U.S.
# keyboard, you will probably want to use:
# Option "XkbModel" "pc102"
# If you have a US Microsoft Natural keyboard, you can use:
# Option "XkbModel" "microsoft"
#
# Then to change the language, change the Layout setting.
# For example, a german layout can be obtained with:
# Option "XkbLayout" "de"
# or:
# Option "XkbLayout" "de"
# Option "XkbVariant" "nodeadkeys"
#
# If you'd like to switch the positions of your capslock and
# control keys, use:
# Option "XkbOptions" "ctrl:swapcaps"
# Or if you just want both to be control, use:
# Option "XkbOptions" "ctrl:nocaps"
#
Identifier "Keyboard0"
Driver "kbd"
Option "XkbModel" "pc105"
Option "XkbLayout" "us"
EndSection
Section "InputDevice"
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "IMPS/2"
Option "Device" "/dev/input/mice"
Option "ZAxisMapping" "4 5"
Option "Emulate3Buttons" "no"
EndSection
Section "Monitor"
Identifier "Monitor0"
VendorName "Monitor Vendor"
ModelName "Dell 1704FPT (Digital)"
HorizSync 30.0 - 80.0
VertRefresh 56.0 - 76.0
Option "dpms"
EndSection
Section "Monitor"
Identifier "Monitor1"
VendorName "Monitor Vendor"
ModelName "Dell 1704FPT (Digital)"
HorizSync 30.0 - 80.0
VertRefresh 56.0 - 76.0
Option "dpms"
EndSection
Section "Device"
Identifier "nvidia0"
Driver "nvidia"
VendorName "Videocard vendor"
BoardName "NVIDIA PCI-Express Quadro FX 1400"
BusID "PCI:5:0:0"
Screen 0
EndSection
Section "Device"
Identifier "nvidia1"
Driver "nvidia"
VendorName "Videocard vendor"
BoardName "NVIDIA PCI-Express Quadro FX 1400"
BusID "PCI:5:0:0"
Screen 1
EndSection
Section "Screen"
Identifier "Screen0"
Device "nvidia0"
Monitor "Monitor0"
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Depth 16
Modes "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 24
Modes "1280x1024" "1280x960" "1152x864" "1024x768" "800x600" "640x480"
EndSubSection
EndSection
Section "Screen"
Identifier "Screen1"
Device "nvidia1"
Monitor "Monitor1"
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Depth 16
Modes "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 24
Modes "1280x1024" "1280x960" "1152x864" "1024x768" "800x600" "640x480"
EndSubSection
EndSection
Section "DRI"
Group 0
Mode 0666
EndSection
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Thanks for the configuration file, it will be useful to everyone.
I had actually asked for a picture/snap of your display 
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