Problem with Dual display in Redhat Enterprise linux WS release 3
 

The dual display was working before. All of a sudden only a monitor comes on. I changed VGA cable of the troubled monitor but single display persist. During system start up, both monitors comes on. The starting process and checking activities on the OS comes up on both monitors. Upon logon, only one monitor comes up.

Below is the /etc/X11/xorg.conf and a command lspci -v


xxxx:xxxx:[/etc/X11] >more XF86Config
# nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig: version 1.0 (buildmeister@builder26) Wed Dec 14 17:16:10 PST 2005

Section "ServerLayout"
Identifier "Layout0"
Screen 0 "Screen0"
InputDevice "Keyboard0" "CoreKeyboard"
InputDevice "Mouse0" "CorePointer"
EndSection

Section "Files"
RgbPath "/usr/X11R6/lib/X11/rgb"
FontPath "unix/:7100"
EndSection

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

Section "InputDevice"
# generated from data in "/etc/sysconfig/mouse"
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "PS/2"
Option "Device" "/dev/psaux"
Option "Emulate3Buttons" "no"
Option "ZAxisMapping" "4 5"
EndSection

Section "InputDevice"
# generated from data in "/etc/sysconfig/keyboard"
Identifier "Keyboard0"
Driver "keyboard"
Option "XkbLayout" "us"
Option "XkbModel" "pc105"
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

xxxx:xxxx:[/etc/X11] >



xxxxx:xxxxx:[/u/ngbc] >lspci -v
00:06.0 PCI bridge: Advanced Micro Devices [AMD] AMD-8111 PCI (rev 07) (prog-if 00 [Normal decode])
Flags: bus master, 66Mhz, medium devsel, latency 64
Bus: primary=00, secondary=01, subordinate=01, sec-latency=69
I/O behind bridge: 00002000-00002fff
Memory behind bridge: c0100000-c01fffff
Capabilities: <available only to root>

00:07.0 ISA bridge: Advanced Micro Devices [AMD] AMD-8111 LPC (rev 05)
Subsystem: IBM: Unknown device 02b7
Flags: bus master, 66Mhz, medium devsel, latency 0

00:07.1 IDE interface: Advanced Micro Devices [AMD] AMD-8111 IDE (rev 03) (prog-if 8a [Master SecP PriP])
Subsystem: IBM: Unknown device 02b7
Flags: bus master, medium devsel, latency 64
I/O ports at 1460 [size=16]

00:07.2 SMBus: Advanced Micro Devices [AMD] AMD-8111 SMBus 2.0 (rev 02)
Subsystem: IBM: Unknown device 02b7
Flags: medium devsel, IRQ 19
I/O ports at 1440 [size=32]

00:07.3 Bridge: Advanced Micro Devices [AMD] AMD-8111 ACPI (rev 05)
Subsystem: IBM: Unknown device 02b7
Flags: medium devsel

00:07.5 Multimedia audio controller: Advanced Micro Devices [AMD] AMD-8111 AC97 Audio (rev 03)
Subsystem: IBM: Unknown device 02b7
Flags: bus master, medium devsel, latency 64, IRQ 17
I/O ports at 1000 [size=256]
I/O ports at 1400 [size=64]

00:0a.0 PCI bridge: Advanced Micro Devices [AMD] AMD-8131 PCI-X Bridge (rev 12) (prog-if 00 [Normal decode])
Flags: bus master, 66Mhz, medium devsel, latency 64
Bus: primary=00, secondary=02, subordinate=02, sec-latency=64
Capabilities: <available only to root>

00:0a.1 PIC: Advanced Micro Devices [AMD] AMD-8131 PCI-X IOAPIC (rev 01) (prog-if 10 [IO-APIC])
Subsystem: Advanced Micro Devices [AMD] AMD-8131 PCI-X IOAPIC
Flags: bus master, medium devsel, latency 0

00:0b.0 PCI bridge: Advanced Micro Devices [AMD] AMD-8131 PCI-X Bridge (rev 12) (prog-if 00 [Normal decode])
Flags: bus master, 66Mhz, medium devsel, latency 64
Bus: primary=00, secondary=03, subordinate=03, sec-latency=64
Memory behind bridge: c0200000-c02fffff
Capabilities: <available only to root>

00:0b.1 PIC: Advanced Micro Devices [AMD] AMD-8131 PCI-X IOAPIC (rev 01) (prog-if 10 [IO-APIC])
Subsystem: Advanced Micro Devices [AMD] AMD-8131 PCI-X IOAPIC
Flags: bus master, medium devsel, latency 0

00:18.0 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] HyperTransport Technology Configuration
Flags: fast devsel
Capabilities: <available only to root>

00:18.1 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Address Map
Flags: fast devsel

00:18.2 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] DRAM Controller
Flags: fast devsel

00:18.3 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Miscellaneous Control
Flags: fast devsel

00:19.0 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] HyperTransport Technology Configuration
Flags: fast devsel
Capabilities: <available only to root>

00:19.1 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Address Map
Flags: fast devsel

00:19.2 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] DRAM Controller
Flags: fast devsel

00:19.3 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Miscellaneous Control
Flags: fast devsel

01:00.0 USB Controller: Advanced Micro Devices [AMD] AMD-8111 USB (rev 0b) (prog-if 10 [OHCI])
Subsystem: IBM: Unknown device 02b7
Flags: bus master, medium devsel, latency 64, IRQ 19
Memory at c0104000 (32-bit, non-prefetchable) [size=4K]

01:00.1 USB Controller: Advanced Micro Devices [AMD] AMD-8111 USB (rev 0b) (prog-if 10 [OHCI])
Subsystem: IBM: Unknown device 02b7
Flags: bus master, medium devsel, latency 64, IRQ 19
Memory at c0105000 (32-bit, non-prefetchable) [size=4K]

01:02.0 Mass storage controller: Silicon Image, Inc. SiI 3512 [SATALink/SATARaid] Serial ATA Controller (rev 01)
Subsystem: IBM: Unknown device 3512
Flags: bus master, 66Mhz, medium devsel, latency 64, IRQ 17
I/O ports at 2020 [size=8]
I/O ports at 2014 [size=4]
I/O ports at 2018 [size=8]
I/O ports at 2010 [size=4]
I/O ports at 2000 [size=16]
Memory at c0106000 (32-bit, non-prefetchable) [size=512]
Expansion ROM at <unassigned> [disabled] [size=512K]
Capabilities: <available only to root>

01:03.0 USB Controller: NEC Corporation USB (rev 43) (prog-if 10 [OHCI])
Subsystem: IBM: Unknown device 02b7
Flags: bus master, medium devsel, latency 64, IRQ 18
Memory at c0107000 (32-bit, non-prefetchable) [size=4K]
Capabilities: <available only to root>

01:03.1 USB Controller: NEC Corporation USB (rev 43) (prog-if 10 [OHCI])
Subsystem: IBM: Unknown device 02b7
Flags: bus master, medium devsel, latency 64, IRQ 19
Memory at c0108000 (32-bit, non-prefetchable) [size=4K]
Capabilities: <available only to root>

01:03.2 USB Controller: NEC Corporation USB 2.0 (rev 04) (prog-if 20 [EHCI])
Subsystem: IBM: Unknown device 02b7
Flags: bus master, medium devsel, latency 132, IRQ 16
Memory at c0106400 (32-bit, non-prefetchable) [size=256]
Capabilities: <available only to root>

01:04.0 FireWire (IEEE 1394): Texas Instruments TSB43AB22/A IEEE-1394a-2000 Controller (PHY/Link) (prog-if 10 [OHCI])
Subsystem: IBM: Unknown device 02b7
Flags: bus master, medium devsel, latency 64, IRQ 19
Memory at c0106800 (32-bit, non-prefetchable) [size=2K]
Memory at c0100000 (32-bit, non-prefetchable) [size=16K]
Capabilities: <available only to root>

03:02.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5703X Gigabit Ethernet (rev 02)
Subsystem: IBM: Unknown device 026f
Flags: bus master, 66Mhz, medium devsel, latency 64, IRQ 28
Memory at c0200000 (64-bit, non-prefetchable) [size=64K]
Capabilities: <available only to root>

80:00.0 Memory controller: nVidia Corporation CK804 Memory Controller (rev a3)
Subsystem: IBM: Unknown device 02b7
Flags: bus master, 66Mhz, fast devsel, latency 0
Capabilities: <available only to root>

80:01.0 Memory controller: nVidia Corporation CK804 Memory Controller (rev a3)
Subsystem: IBM: Unknown device 02b7
Flags: bus master, 66Mhz, fast devsel, latency 0
Memory at c0500000 (32-bit, non-prefetchable) [size=4K]

80:0d.0 PCI bridge: nVidia Corporation CK804 PCIE Bridge (rev a3) (prog-if 00 [Normal decode])
Flags: bus master, fast devsel, latency 0
Bus: primary=80, secondary=81, subordinate=83, sec-latency=0
I/O behind bridge: 00003000-00003fff
Memory behind bridge: c0600000-c06fffff
Secondary status: SERR
Capabilities: <available only to root>

80:0e.0 PCI bridge: nVidia Corporation CK804 PCIE Bridge (rev a3) (prog-if 00 [Normal decode])
Flags: bus master, fast devsel, latency 0
Bus: primary=80, secondary=84, subordinate=84, sec-latency=0
Memory behind bridge: c1000000-c2ffffff
Prefetchable memory behind bridge: 00000000d0000000-00000000dff00000
Capabilities: <available only to root>

81:00.0 PCI bridge: NEC Corporation: Unknown device 0125 (rev 03) (prog-if 00 [Normal decode])
Flags: bus master, fast devsel, latency 0
Bus: primary=81, secondary=82, subordinate=82, sec-latency=68
Capabilities: <available only to root>

81:00.1 PCI bridge: NEC Corporation: Unknown device 0125 (rev 03) (prog-if 00 [Normal decode])
Flags: bus master, fast devsel, latency 0
Bus: primary=81, secondary=83, subordinate=83, sec-latency=102
I/O behind bridge: 00003000-00003fff
Memory behind bridge: c0600000-c06fffff
Capabilities: <available only to root>

83:04.0 SCSI storage controller: Adaptec AIC-7902B U320 (rev 10)
Subsystem: IBM: Unknown device 02b7
Flags: bus master, 66Mhz, slow devsel, latency 72, IRQ 37
I/O ports at 3400 [size=256]
Memory at c0600000 (64-bit, non-prefetchable) [disabled] [size=8K]
I/O ports at 3000 [size=256]
Expansion ROM at <unassigned> [disabled] [size=512K]
Capabilities: <available only to root>

83:04.1 SCSI storage controller: Adaptec AIC-7902B U320 (rev 10)
Subsystem: IBM: Unknown device 02b7
Flags: bus master, 66Mhz, slow devsel, latency 72, IRQ 36
I/O ports at 3c00 [size=256]
Memory at c0602000 (64-bit, non-prefetchable) [disabled] [size=8K]
I/O ports at 3800 [size=256]
Expansion ROM at <unassigned> [disabled] [size=512K]
Capabilities: <available only to root>

84:00.0 VGA compatible controller: nVidia Corporation NV45GL [Quadro FX 3400/4400] (rev a2) (prog-if 00 [VGA])
Subsystem: nVidia Corporation: Unknown device 029b
Flags: bus master, fast devsel, latency 0, IRQ 37
Memory at c2000000 (32-bit, non-prefetchable) [size=16M]
Memory at d0000000 (32-bit, prefetchable) [size=256M]
Memory at c1000000 (32-bit, non-prefetchable) [size=16M]
Expansion ROM at <unassigned> [disabled] [size=128K]
Capabilities: <available only to root>

xxxxx:xxxx:[/u/ngbc] >

Ok...what do you think we can tell you from this?

If it WAS working and now it ISN'T, then something changed, or a piece of hardware has broken. Not much else it could be....so, what did you change, and have you tried a different monitor? And since you're using RHEL, have you contacted RHEL support?

No new Hardware was added and nothing was broken. No hardware change.I have changed monitor and VGA cable, yet no solution.
Please find attached the settings for nvidia. I have not contacted Redhat support. I do not know if we have support.

more nvidia setting in the attachment. The NVIDIA version is;
NVRM Version: NVIDIA LINUX x86-64 NVIDIA Kernel Module 1.0-8178

GCC VERSION: 3.2.3 20030502 (Red Hat Linux 3.2.3-53)

Again, if it WAS working and now it ISN'T...then SOMETHING HAS CHANGED.

Showing the setting as they ARE, doesn't tell us anything about what it WAS. If you are 100% certain that ALL the hardware (card, cables, and monitors) are working, then there has been a software change. You can follow the VERY well documented nVidia procedures for doing dual-display, either using Twinview or Xinerama, and get it working again, or restore a copy of your xorg.conf file from backups.

Go to http://www.nvidia.com, and check out their documentation.