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Fox,

I would like to make this post in order to save the time to people who would like to use 3-4 monitors on PUIAS 6.4 (RedHat 6.4 clone). My Lab just got some Dell Precisions T1650 with few upgrades comparing to the standard corporate workstation. One of upgrades we picked was a single AMD FirePro 2270 video card which has a dual DVI output and drives two monitors out of box. My co-worker wanted to have thee monitors so I put another AMD FirePro 2270 into the unused PCI-Express express slot. This is xorg.conf file I created by manually editing xorg.conf produced by X -configure utility which now drives four monotors. Make sure you put it into /etc/X11/ directory. You can test the server with X -config /etc/X11/xorg.conf before rebooting and allowing the changes to take the place. For the record built in Intel VGA output only video card was not seen at all by X -configure and I just didn't want to waist more time breaking into BIOS and checking what is going on. My hunch is that is automatically disabled when you have video cards in PCI-Express. Enjoy!!!

Section "ServerLayout"
    Identifier     "X.org Configured"
    Screen      0  "Screen0" 0 0
    Screen      1  "Screen1" RightOf "Screen0"
    Screen      2  "Screen2" RightOf "Screen1"
    Screen      3  "Screen3" RightOf "Screen1"
    InputDevice    "Mouse0" "CorePointer"
    InputDevice    "Keyboard0" "CoreKeyboard"
EndSection

Section "Files"
    ModulePath   "/usr/lib64/xorg/modules"
    FontPath     "catalogue:/etc/X11/fontpath.d"
    FontPath     "built-ins"
EndSection

Section "Module"
    Load  "glx"
EndSection

Section "InputDevice"
    Identifier  "Keyboard0"
    Driver      "kbd"
[predrag@test ~]$ more /etc/X11/xorg.conf
Section "ServerLayout"
    Identifier     "X.org Configured"
    Screen      0  "Screen0" 0 0
    Screen      1  "Screen1" RightOf "Screen0"
    Screen      2  "Screen2" RightOf "Screen1"
    Screen      3  "Screen3" RightOf "Screen1"
    InputDevice    "Mouse0" "CorePointer"
    InputDevice    "Keyboard0" "CoreKeyboard"
EndSection

Section "Files"
    ModulePath   "/usr/lib64/xorg/modules"
    FontPath     "catalogue:/etc/X11/fontpath.d"
    FontPath     "built-ins"
EndSection

Section "Module"
    Load  "glx"
EndSection

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

Section "InputDevice"
    Identifier  "Mouse0"
    Driver      "mouse"
    Option      "Protocol" "auto"
    Option      "Device" "/dev/input/mice"
    Option      "ZAxisMapping" "4 5 6 7"
EndSection

Section "Monitor"
    Identifier   "Monitor0"
    VendorName   "Monitor Vendor"
    ModelName    "Monitor Model"
EndSection

Section "Monitor"
    Identifier   "Monitor1"
    VendorName   "Monitor Vendor"
    ModelName    "Monitor Model"
EndSection

Section "Monitor"
    Identifier   "Monitor2"
    VendorName   "Monitor Vendor"
    ModelName    "Monitor Model"
EndSection

Section "Monitor"
    Identifier   "Monitor3"
    VendorName   "Monitor Vendor"
    ModelName    "Monitor Model"
EndSection

Section "Device"
        ### Available Driver options are:-
        ### Values: <i>: integer, <f>: float, <bool>: "True"/"False",
        ### <string>: "String", <freq>: "<f> Hz/kHz/MHz",
        ### <percent>: "<f>%"
        ### [arg]: arg optional
        #Option     "NoAccel"               # [<bool>]
        #Option     "SWcursor"              # [<bool>]
        #Option     "EnablePageFlip"        # [<bool>]
        #Option     "AccelDFS"              # [<bool>]
        #Option     "IgnoreEDID"            # [<bool>]
        #Option     "ColorTiling"           # [<bool>]
        #Option     "ColorTiling2D"         # [<bool>]
        #Option     "RenderAccel"           # [<bool>]
        #Option     "SubPixelOrder"         # [<str>]
        #Option     "AccelMethod"           # <str>
        #Option     "DRI"                   # [<bool>]
        #Option     "TVStandard"            # <str>
        #Option     "EXAVSync"              # [<bool>]
        #Option     "EXAPixmaps"            # [<bool>]
        #Option     "ZaphodHeads"           # <str>
        #Option     "EnablePageFlip"        # [<bool>]
        #Option     "SwapbuffersWait"       # [<bool>]
    Identifier  "Card0"
    Driver      "radeon"
    BusID       "PCI:1:0:0"
EndSection

Section "Device"
        ### Available Driver options are:-
        ### Values: <i>: integer, <f>: float, <bool>: "True"/"False",
        ### <string>: "String", <freq>: "<f> Hz/kHz/MHz",
        ### <percent>: "<f>%"
        ### [arg]: arg optional
        #Option     "NoAccel"               # [<bool>]
        #Option     "SWcursor"              # [<bool>]
        #Option     "EnablePageFlip"        # [<bool>]
        #Option     "AccelDFS"              # [<bool>]
        #Option     "IgnoreEDID"            # [<bool>]
        #Option     "ColorTiling"           # [<bool>]
        #Option     "ColorTiling2D"         # [<bool>]
        #Option     "RenderAccel"           # [<bool>]
        #Option     "SubPixelOrder"         # [<str>]
        #Option     "AccelMethod"           # <str>
        #Option     "DRI"                   # [<bool>]
        #Option     "TVStandard"            # <str>
        #Option     "EXAVSync"              # [<bool>]
        #Option     "EXAPixmaps"            # [<bool>]
        #Option     "ZaphodHeads"           # <str>
        #Option     "EnablePageFlip"        # [<bool>]
        #Option     "SwapbuffersWait"       # [<bool>]
    Identifier  "Card1"
    Driver      "radeon"
    BusID       "PCI:4:0:0"
EndSection

Section "Device"
        ### Available Driver options are:-
        ### Values: <i>: integer, <f>: float, <bool>: "True"/"False",
        ### <string>: "String", <freq>: "<f> Hz/kHz/MHz",
        ### <percent>: "<f>%"
        ### [arg]: arg optional
        #Option     "SWcursor"              # [<bool>]
        #Option     "kmsdev"                # <str>
        #Option     "ShadowFB"              # [<bool>]
    Identifier  "Card2"
    Driver      "modesetting"
    BusID       "PCI:1:0:0"
EndSection

Section "Device"
        ### Available Driver options are:-
        ### Values: <i>: integer, <f>: float, <bool>: "True"/"False",
        ### <string>: "String", <freq>: "<f> Hz/kHz/MHz",
        ### <percent>: "<f>%"
        ### [arg]: arg optional
        #Option     "SWcursor"              # [<bool>]
        #Option     "kmsdev"                # <str>
        #Option     "ShadowFB"              # [<bool>]
    Identifier  "Card3"
    Driver      "modesetting"
    BusID       "PCI:4:0:0"
EndSection


Section "Screen"
    Identifier "Screen0"
    Device     "Card0"
    Monitor    "Monitor0"
    SubSection "Display"
        Viewport   0 0
        Depth     24
    EndSubSection
EndSection

Section "Screen"
    Identifier "Screen1"
    Device     "Card1"
    Monitor    "Monitor1"
    SubSection "Display"
        Viewport   0 0
        Depth     24
    EndSubSection
EndSection

Section "Screen"
    Identifier "Screen2"
    Device     "Card2"
    Monitor    "Monitor2"
    SubSection "Display"
        Viewport   0 0
        Depth     24
    EndSubSection
EndSection

Section "Screen"
    Identifier "Screen3"
    Device     "Card3"
    Monitor    "Monitor3"
    SubSection "Display"
        Viewport   0 0
        Depth     24
    EndSubSection
EndSection
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