Three Monitors, Two Graphics Cards, One Frustrated Man

Hi there,

I've been really loving Mepis at home and I decided to install it at work. At home I found it pretty easy to get my dual monitors on a single GeForce GT 6600 working, but I'm completely stumped with my work setup. The setup with my work PC is: I have two ATI Radeon cards, one an Xpress 200 (onboard) and the other is an X1300. I've been running it in a 3 monitor setup just fine under XP but when I try to configure it in X I get stuck. I've read around but I haven't seemed to come across any answers specific to my problem. The relevant sections of my Xorg.conf as it is right now (broken) are:

Section "ServerLayout"
Identifier "XFree86 Configured"
Screen 0 "FlatronLeft" 0 0
#Screen 1 "Dell" RightOf "FlatronLeft"
Screen 1 "FlatronRight" RightOf "FlatronLeft"
InputDevice "Keyboard0" "CoreKeyboard"
InputDevice "USB Mouse" "CorePointer"
EndSection

Section "ServerFlags"
Option "AllowMouseOpenFail" "true"
Option "Xinerama" "true"
EndSection

...

#Section "Monitor"
# Identifier "DellLCD"
# VendorName "unknown"
# ModelName "unknown"
# Option "DPMS" "true"
# HorizSync 30-82
# VertRefresh 55-70
#EndSection

Section "Monitor"
Identifier "FlatronLCD1"
VendorName "unknown"
ModelName "unknown"
Option "DPMS" "true"
HorizSync 30-82
VertRefresh 55-70
EndSection

Section "Monitor"
Identifier "FlatronLCD2"
VendorName "unknown"
ModelName "unknown"
Option "DPMS" "true"
HorizSync 30-82
VertRefresh 55-70
EndSection

Section "Device"
Identifier "ATIPCIe"
Driver "fglrx"
BoardName "unknown"
BusID "PCI:2:0:0"

Screen 0
Option "UseInternalAGPGART" "no"
Option "DmaMode" "None"
EndSection

Section "Device"
Identifier "OnboardATI"
Driver "fglrx"
BoardName "unknown"
BusID "PCI:1:5:0"

Screen 1
# Option "MonitorLayout" "LFP,LFP"
EndSection

Section "Screen"
Identifier "FlatronLeft"
Device "ATIPCIe"
Monitor "FlatronLCD1"
DefaultColorDepth 24
SubSection "Display"
Depth 24
Modes "1280x1024" "1024x768" "800x600"
EndSubSection
EndSection

#Section "Screen"
# Identifier "Dell"
# Device "OnboardATI"
# Monitor "DellLCD"
# DefaultColorDepth 24
#
# SubSection "Display"
# Depth 24
# Modes "1280x1024" "1024x7680" "800x600"
# EndSubSection
#EndSection

Section "Screen"
Identifier "FlatronRight"
Device "OnboardATI"
Monitor "FlatronLCD2"
DefaultColorDepth 24

SubSection "Display"
Depth 24
Modes "1280x1024" "1024x768" "800x600"
EndSubSection
EndSection

The last configuration that I was able to start X with meant commenting out all the other monitor, screen and device sections except for:
Section "Device"
Identifier "ATIPCIe"
Driver "fglrx"
BoardName "unknown"
BusID "PCI:2:0:0"

Screen 0
Option "UseInternalAGPGART" "no"
Option "DmaMode" "None"
EndSection

However, when I add this (plus the other bits and pieces relating to its monitor and screen sections):
Section "Device"
Identifier "OnboardATI"
Driver "fglrx"
BoardName "unknown"
BusID "PCI:1:5:0"

Screen 1
# Option "MonitorLayout" "LFP,LFP"
EndSection

X refuses to start. Here is what it displays on the screen (from Xorg.0.log):
(II) Primary Device is: PCI 02:00:0
(II) ATI Proprietary Linux Driver Version Identifier:8.31.5
(II) ATI Proprietary Linux Driver Release Identifier: LGDr8.31g1
(II) ATI Proprietary Linux Driver Build Date: Nov 9 2006 18:43:06
(II) ATI Proprietary Linux Driver Build Information: autobuild-rel-r6-8.31.2.1.2.3-driver-lnx-x86-x86_64-305837
(WW) fglrx: No matching Device section for instance (BusID PCI:1:5:0) found
(WW) fglrx: No matching Device section for instance (BusID PCI:1:5:1) found
(WW) fglrx: No matching Device section for instance (BusID PCI:2:0:1) found
(--) Chipset RADEON X1300 (RV516 7183) found
(--) Chipset RADEON XPRESS 200 (RS480 5954) found
...
(EE) Screen 1 deleted because of no matching config section.

I'm a little confused about the "no matching device section" messages. Does this mean that it is detecting my cards, or not? As you can see in the config I have clearly defined the BusID of the second card (the second one is the Xpress 200/onboard one) as being PCI:1:5:0. I have tried changing the "Screen" property of "OnboardATI" to 0, which left me with a blank screen on my main monitor and the other two still off. I'm sure I'm just missing something here but I'm at a loss as to where to find the answer. Any help or nudging in the right direction would be much appreciated!