I am running Red Hat Fedora (2.6.9-1.667) with two videocards and want to run dual monitors. I modified the config file (/etc/X11/xorg.conf) and restarted X and both monitors work just like they are supposed to. I can log in and out, resize the monitor resolutions, and restart X over and over without a hitch.

But when I reboot, I run into problems. Both screens come on when Linux is loading, but as soon as it's time for the login screen to appear, both monitors go black (the monitors are still on). The only way I can get past it is to use a rescue disk and switch the xorg.conf file back to a single monitor system. I have repeated the process numerous time just to be sure it wasn't a momentary glitch, but it's always the same: the dual monitors work fine until reboot.

Does anyone know a workaround?

My config file and video card info is as follows:

# Xorg configuration created by system-config-display

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

Section "Files"
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 "InputDevice"
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" "yes"
EndSection

Section "Monitor"
Identifier "Monitor0"
VendorName "Monitor Vendor"
ModelName "DELL M993s"
DisplaySize 350 260
HorizSync 30.0 - 96.0
VertRefresh 50.0 - 160.0
Option "dpms"
EndSection

Section "Monitor"
Identifier "Monitor1"
VendorName "Monitor Vendor"
ModelName "Monitor 1024x768"
HorizSync 31.5 - 57.0
VertRefresh 50.0 - 70.0
Option "dpms"
EndSection

Section "Device"
Identifier "Videocard0"
Driver "ati"
VendorName "Videocard vendor"
BoardName "ATI Mach64 3D RAGE II"
EndSection

Section "Device"
Identifier "Videocard1"
Driver "radeon"
VendorName "Videocard Vendor"
BoardName "ATI Radeon 9800"
BusID "PCI:1:0:0"
EndSection

Section "Screen"
Identifier "Screen0"
Device "Videocard0"
Monitor "Monitor0"
DefaultDepth 16
SubSection "Display"
Viewport 0 0
Depth 16
Modes "1152x864" "1024x768" "800x600" "640x480"
EndSubSection
EndSection

Section "Screen"
Identifier "Screen1"
Device "Videocard1"
Monitor "Monitor1"
DefaultDepth 16
SubSection "Display"
Viewport 0 0
Depth 16
Modes "1024x768"
EndSubSection
EndSection

Section "DRI"
Group 0
Mode 0666
EndSection




01:00.0 VGA compatible controller: ATI Technologies Inc Radeon R350 [Radeon 9800 Pro] (prog-if 00 [VGA])
Subsystem: ATI Technologies Inc: Unknown device 1002
Flags: stepping, 66Mhz, medium devsel, IRQ 11
Memory at f0000000 (32-bit, prefetchable) [disabled] [size=128M]
I/O ports at de00 [disabled] [size=256]
Memory at fe9e0000 (32-bit, non-prefetchable) [disabled] [size=64K]
Expansion ROM at fea00000 [disabled] [size=128K]
Capabilities: [58] AGP version 3.0
Capabilities: [50] Power Management version 2

01:00.1 Display controller: ATI Technologies Inc Radeon R350 [Radeon 9800 Pro] (Secondary)
Subsystem: ATI Technologies Inc: Unknown device 1003
Flags: bus master, stepping, 66Mhz, medium devsel, latency 64
Memory at e8000000 (32-bit, prefetchable) [size=128M]
Memory at fe9f0000 (32-bit, non-prefetchable) [size=64K]
Capabilities: [50] Power Management version 2

02:03.0 VGA compatible controller: ATI Technologies Inc 3D Rage I/II 215GT [Mach64 GT] (rev 41) (prog-if 00 [VGA])
Subsystem: ATI Technologies Inc 3D Rage I/II 215GT [Mach64 GT]
Flags: bus master, stepping, medium devsel, latency 64
Memory at fd000000 (32-bit, non-prefetchable) [size=16M]
I/O ports at ce00 [size=256]
Memory at fe7db000 (32-bit, non-prefetchable) [size=4K]
Expansion ROM at fe800000 [disabled] [size=128K]

Try adding a BusID to this card.

At least I think this is the correct number going by what you have posted, if not then try X -configure without the X server running and you should get the proper value for it in the file that will be created. If you cannot get it to work can you post the /var/log/xorg.0.log file copy it to a backup before you do the edit to get X starting again. Oh and I assume that the Raedeon is your primary card if so then you should change around the settings in the file so it is video0 and you should get the proper refresh rates for your second monitor those look a little low to be the proper ones for the monitor.