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Old 02-08-10, 12:54 PM   #1
nlaivlys
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Join Date: Feb 2010
Posts: 2
Default Triple Head Red Hat Linux Setup Problems

I am having a heck of a time trying to get a three-monitor configuration running. Variables are:
(1) One HP xw9400 workstation running RedHat Advanced Platform 5.4 (i386)
(2) Three HP LP2275w monitors
(3) 2 nvidia cards: (First) Quadro FX 3700, (Second) Quadro FX 3500
(4) using nvidia_1.77.80-1 drdiver
Issue:
Using the Nvidia configuration icon on the desktop, I can see all three monitors. However, the two monitors connected to the first card seem active, while the third monitor on the second card reads DISABLED. Every time I try to enable the third monitor, save the configuration and quit the application, nothing changes and if I re-enter the nvidia configuration tool, the third monitor is DISABLED again. It's as if it cannot stay enabled. I have looked in the BIOS and all PCI slots are enabled. I have tried to use the updated nvidia driver (nvidia_190.53), however, this didn’t help. I have also tried to use a working three head xorg configuration file (modified with my parameters), however that did not help either - as the second card still reads as disabled.
Here is the current xorg configuration file.
# nvidia-settings: X configuration file generated by nvidia-settings
# nvidia-settings: version 1.0 Mon May 19 00:34:28 PDT 2008

Section "ServerLayout"
Identifier "Default Layout"
Screen 0 "Screen0" 0 0
Screen 1 "Screen1" RightOf "Screen0"
InputDevice "Mouse0" "CorePointer"
InputDevice "Keyboard0" "CoreKeyboard"
EndSection

Section "Files"
FontPath "unix/:7100"
EndSection

Section "Module"
Load "dbe"
Load "extmod"
Load "type1"
Load "freetype"
Load "glx"
Load "vnc"
EndSection

Section "ServerFlags"
Option "Xinerama" "0"
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 "HP LP2275w"
HorizSync 30.0 - 93.0
VertRefresh 48.0 - 85.0
Option "DPMS"
EndSection

Section "Monitor"
Identifier "Monitor1"
VendorName "Unknown"
ModelName " HP LP2275w "
HorizSync 30.0 - 93.0
VertRefresh 48.0 - 85.0
EndSection

Section "Device"
Identifier "Videocard0"
Driver "nvidia"
VendorName "NVIDIA Corporation"
BoardName "Quadro FX 3700"
BusID "PCI:24:0:0"
EndSection

Section "Device"
Identifier "Videocard1"
Driver "nvidia"
VendorName "NVIDIA Corporation"
BoardName " Quadro FX 3500"
BusID "PCI:88:0:0"
EndSection

Section "Screen"
Identifier "Screen0"
Device "Videocard0"
Monitor "Monitor0"
DefaultDepth 24
Option "SecurityTypes" "None"
Option "TwinView" "1"
Option "TwinViewXineramaInfoOrder" "DFP-0"
Option "metamodes" "DFP-0: 1280x1024_60 +0+0, DFP-1: nvidia-auto-select +1280+0"
SubSection "Display"
Depth 24
EndSubSection
EndSection

Section "Screen"
Identifier "Screen1"
Device "Videocard1"
Monitor "Monitor1"
DefaultDepth 24
Option "TwinView" "0"
Option "metamodes" "nvidia-auto-select +0+0"
EndSection

What I have found is if I remove the first card, and leave the second card, I cannot enable X…it seems to not work. I get a “no screen; device not found” error. I can move that second card to the first slot (where the first card was located) and it works. It simply seems as if there is some underlying hardware problem with using two cards.
Not sure what else to check or how to proceed. Any suggestions?
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Old 03-09-10, 12:45 PM   #2
nlaivlys
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Join Date: Feb 2010
Posts: 2
Default Re: Triple Head Red Hat Linux Setup Problems

After working with HP, here is the solution:

The xw9400 product, as far as the CPU bus, is a bit unique in the way it handles multiple processor support as memory and graphics are actually dedicated on a per CPU basis and not shared as would normally be expected. HP recommended identical video cards.

The final solution was to disable the 'ACPI Bus Segmentation' setting in the BIOS, under ‘Advanced’ -> ‘Chipset/Memory’.

This setting is there to support some legacy operating systems. Some of the older operating systems did not handle the memory controller on the Xw9300 and 9400 very well since the memory controller on these units was not on the north bridge.

After disabling this setting, I was able to run the nvidia-xconfig utility and configure 3 monitors without problems.
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