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Old 07-15-2009, 12:41 PM   #1
chris24300
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Registered: Jul 2009
Posts: 58

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Triple Monitor setup


Hi, I'm using CentOS and I have 3 LCD monitors in front of me. I initially had a dual setup that worked but now I cannot get the additional monitor to display anything. I have 2 GeForce 9600 GT's, and I have modified the xorg.conf file to what I believe is correct. When I restart the X server, the 2 monitors I used as duals will reboot normally but the 3rd still stays blank.

Here is my xorg.conf file:
Code:
# Xorg configuration created by system-config-display

Section "ServerLayout"
	Identifier     "Multihead Layout"
	Screen      0  "Screen0" LeftOf "Screen1"
	Screen      1  "Screen1" LeftOf "Screen2"
	Screen	    2  "Screen2" RightOf "Screen1"
	InputDevice    "Mouse0" "CorePointer"
	InputDevice    "Keyboard0" "CoreKeyboard"
	Option	    "Xinerama" "on"
	Option	    "Clone" "off"
EndSection

Section "ServerFlags"
	Option	    "Xinerama" "1"
EndSection

Section "InputDevice"

    # generated from default
	Identifier  "Mouse0"
	Driver      "mouse"
	Option	    "Protocol" "auto"
	Option	    "Device" "/dev/input/mice"
	Option	    "Emulate3Buttons" "no"
	Option	    "ZAxisMapping" "4 5"
EndSection

Section "InputDevice"
	Identifier  "Keyboard0"
	Driver      "kbd"
	Option	    "XkbModel" "pc105"
	Option	    "XkbLayout" "us"
EndSection

Section "Monitor"
	Identifier   "Monitor0"
	VendorName   "Unknown"
	ModelName    "Samsung SyncMaster"
 ### Comment all HorizSync and VertSync values to use DDC:
	HorizSync    30.0 - 81.0
	VertRefresh  50.0 - 75.0
	Option	    "DPMS"
EndSection

Section "Monitor"
	Identifier   "Monitor1"
	VendorName   "Monitor Vendor"
	ModelName    "Samsung SyncMaster"
 ### Comment all HorizSync and VertSync values to use DDC:
	HorizSync    30.0 - 81.0
	VertRefresh  50.0 - 75.0
	Option	     "DPMS"
EndSection

Section "Monitor"
	Identifier   "Monitor2"
	VendorName   "Unknown"
	ModelName    "Samsung SyncMaster"
 ### Comment all HorizSync and VertSync values to use DDC:
	HorizSync    38.0 - 81.0
	VertRefresh  50.0 - 75.0
	Option	     "DPMS"
EndSection

Section "Device"
	Identifier  "Videocard0"
	Driver      "nvidia"
EndSection

Section "Device"
	Identifier  "Videocard1A"
	Driver      "nvidia"
	VendorName  "NVIDIA Corporation"
	BoardName   "GeForce 9600 GT"
	BusID       "PCI:1:0:0"
	Screen	    0
	Option	"DDCMode" "true"
EndSection

Section "Device"
	Identifier  "Videocard1B"
	Driver	    "nvidia"
	VendorName  "NVIDIA Corporation"
	BoardName   "GeForce 9600 GT (Secondary)"
	BusID	    "PCI:1:0:0"
	Screen	    1
	Option	"DDCMode" "true"
EndSection

Section "Device"
	Identifier  "Videocard2A"
	Driver      "nvidia"
	VendorName  "NVIDIA Corporation"
	BoardName   "GeForce 9600 GT"
	BusID       "PCI:1:0:0"
	Screen      0
	Option	"DDCMode" "true"
EndSection

Section "Device"
	Identifier  "Videocard2B"
	Driver	    "nvidia"
	VendorName  "NVIDIA Corporation"
	BoardName   "GeForce 9600 GT (Secondary)"
	BusID	    "PCI:1:0:0"
	Screen	    1
	Option 	"DDCMode" "true"
EndSection

Section "Screen"
	Identifier "Screen0"
	Device     "Videocard1A"
	Monitor    "Monitor0"
	DefaultDepth     24
	Option	    "TwinView" "0"
	Option	    "metamodes" "DFP-0: nvidia-auto-select +0+0"
	SubSection "Display"
		Depth     24
		Modes    "800x600" "640x480"
	EndSubSection
EndSection

Section "Screen"
	Identifier "Screen1"
	Device     "Videocard1B"
	Monitor    "Monitor1"
	DefaultDepth     24
	Option	    "TwinView" "0"
	Option	    "metamodes" "DFP-1: nvidia-auto-select +0+0"
	SubSection "Display"
		Depth     24
	EndSubSection
EndSection

Section "Screen"
	Identifier "Screen2"
	Device     "Videocard2A"
	Monitor    "Monitor2"
	DefaultDepth     24
	Option	    "TwinView" "0"
	Option	    "metamodes" "DFP-2: nvidia-auto-select +0+0"
	SubSection "Display"
		Depth     24
	EndSubSection
EndSection
I do have Dual head enabled in the display settings, if that matters.

Thanks,
Chris
 
Old 07-15-2009, 12:53 PM   #2
jhwilliams
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Registered: Apr 2007
Location: Portland, OR
Distribution: Debian, Android, LFS
Posts: 1,168

Rep: Reputation: 210Reputation: 210Reputation: 210
Here was a tri-head attempt I made in 2004, on *the other linux forum...*
http://www.linuxforums.org/forum/lin...onf-issue.html

Perhaps it will provide some insights!
 
Old 07-15-2009, 01:51 PM   #3
chris24300
Member
 
Registered: Jul 2009
Posts: 58

Original Poster
Rep: Reputation: 15
Thanks jhwilliams, I figured out the problem from your thread. I didn't realize I left the PCI slots the same for both videocards... So after changing videocard 2A & B to PCI:2:0:0 everything works fine.
 
  


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