グラボ2枚（オンボードとPCI-E）でトリディスプレイ環境を作ろうとしていますが、エラーが出ています。X.orgがつまづいているようです。
ローグラフィックモードで起動して、Catalystマネージャから見るとRadeon 4850は認識されていてもRadeon 3300は認識されておらず不明なデバイスとなってしまっています。

xのログを見ると設定に問題がある用ですが、設定の仕方が昔と変わってしまって分かりません。設定方法のヒントください！

環境
Kernel 2.6.30.1
AMD 790GX Chipset (Radeon 3300)
ATI Radeon 4850

Phenom II X4
8GB Memory

X.orgのログです。
X.Org X Server 1.6.0
Release Date: 2009-2-25
X Protocol Version 11, Revision 0
Build Operating System: Linux 2.6.24-23-server i686 Ubuntu
Current Operating System: Linux Desktop 2.6.30.1 #1 SMP Wed Sep 16 14:00:22 JST
2009 i686
Build Date: 09 April 2009  02:10:02AM
xorg-server 2:1.6.0-0ubuntu14 ([email protected])
    Before reporting problems, check http://wiki.x.org
    to make sure that you have the latest version.
Markers: (--) probed, (**) from config file, (==) default setting,
    (++) from command line, (!!) notice, (II) informational,
    (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(==) Log file: "/var/log/Xorg.0.log", Time: Wed Oct  7 20:35:26 2009
(==) Using config file: "/etc/X11/xorg.conf"
(==) ServerLayout "aticonfig Layout"
(**) |-->Screen "aticonfig-Screen[0]-0" (0)
(**) |   |-->Monitor "aticonfig-Monitor[0]-0"
(**) |   |-->Device "aticonfig-Device[0]-0"
(==) Automatically adding devices
(==) Automatically enabling devices
(WW) The directory "/usr/share/fonts/X11/cyrillic" does not exist.
    Entry deleted from font path.
(==) FontPath set to:
    /usr/share/fonts/X11/misc,
    /usr/share/fonts/X11/100dpi/:unscaled,
    /usr/share/fonts/X11/75dpi/:unscaled,
    /usr/share/fonts/X11/Type1,
    /usr/share/fonts/X11/100dpi,
    /usr/share/fonts/X11/75dpi,
    /var/lib/defoma/x-ttcidfont-conf.d/dirs/TrueType,
    built-ins
(==) ModulePath set to "/usr/lib/xorg/modules"
(II) Cannot locate a core pointer device.
(II) Cannot locate a core keyboard device.
(II) The server relies on HAL to provide the list of input devices.
    If no devices become available, reconfigure HAL or disable AllowEmptyInp
ut.
(II) Loader magic: 0x3bc0
(II) Module ABI versions:
    X.Org ANSI C Emulation: 0.4
    X.Org Video Driver: 5.0
    X.Org XInput driver : 4.0
    X.Org Server Extension : 2.0
(II) Loader running on linux
(++) using VT number 7

(--) PCI: (0@1:5:0) ATI Technologies Inc Radeon HD 3300 Graphics rev 0, Mem @ 0x
c0000000/268435456, 0xfe8f0000/65536, 0xfe700000/1048576, I/O @ 0x0000c000/256
(--) PCI:*(0@2:0:0) ATI Technologies Inc RV770 [Radeon HD 4850] rev 0, Mem @ 0xd
0000000/268435456, 0xfe9f0000/65536, I/O @ 0x0000d000/256, BIOS @ 0x????????/131
072
(II) Open ACPI successful (/var/run/acpid.socket)
(II) System resource ranges:
    [0] -1    0    0xffffffff - 0xffffffff (0x1) MX[b]
    [1] -1    0    0x000f0000 - 0x000fffff (0x10000) MX[b]
    [2] -1    0    0x000c0000 - 0x000effff (0x30000) MX[b]
    [3] -1    0    0x00000000 - 0x0009ffff (0xa0000) MX[b]
    [4] -1    0    0xffffffff - 0xffffffff (0x1) MX[b]
    [5] -1    0    0x000f0000 - 0x000fffff (0x10000) MX[b]
    [6] -1    0    0x000c0000 - 0x000effff (0x30000) MX[b]
    [7] -1    0    0x00000000 - 0x0009ffff (0xa0000) MX[b]
    [8] -1    0    0xffffffff - 0xffffffff (0x1) MX[b]
    [9] -1    0    0x000f0000 - 0x000fffff (0x10000) MX[b]
    [10] -1    0    0x000c0000 - 0x000effff (0x30000) MX[b]
    [11] -1    0    0x00000000 - 0x0009ffff (0xa0000) MX[b]
    [12] -1    0    0xffffffff - 0xffffffff (0x1) MX[b]
    [13] -1    0    0x000f0000 - 0x000fffff (0x10000) MX[b]
    [14] -1    0    0x000c0000 - 0x000effff (0x30000) MX[b]
    [15] -1    0    0x00000000 - 0x0009ffff (0xa0000) MX[b]
    [16] -1    0    0xffffffff - 0xffffffff (0x1) MX[b]
    [17] -1    0    0x000f0000 - 0x000fffff (0x10000) MX[b]
    [18] -1    0    0x000c0000 - 0x000effff (0x30000) MX[b]
    [19] -1    0    0x00000000 - 0x0009ffff (0xa0000) MX[b]
    [20] -1    0    0xffffffff - 0xffffffff (0x1) MX[b]
    [21] -1    0    0x000f0000 - 0x000fffff (0x10000) MX[b]
    [22] -1    0    0x000c0000 - 0x000effff (0x30000) MX[b]
    [23] -1    0    0x00000000 - 0x0009ffff (0xa0000) MX[b]
    [24] -1    0    0x0000ffff - 0x0000ffff (0x1) IX[b]
    [25] -1    0    0x00000000 - 0x00000000 (0x1) IX[b]
    [26] -1    0    0x0000ffff - 0x0000ffff (0x1) IX[b]
    [27] -1    0    0x00000000 - 0x00000000 (0x1) IX[b]
    [28] -1    0    0x0000ffff - 0x0000ffff (0x1) IX[b]
    [29] -1    0    0x00000000 - 0x00000000 (0x1) IX[b]
    [30] -1    0    0x0000ffff - 0x0000ffff (0x1) IX[b]
    [31] -1    0    0x00000000 - 0x00000000 (0x1) IX[b]
    [32] -1    0    0x0000ffff - 0x0000ffff (0x1) IX[b]
    [33] -1    0    0x00000000 - 0x00000000 (0x1) IX[b]
    [34] -1    0    0x0000ffff - 0x0000ffff (0x1) IX[b]
    [35] -1    0    0x00000000 - 0x00000000 (0x1) IX[b]
(II) LoadModule: "extmod"
(II) Loading /usr/lib/xorg/modules/extensions//libextmod.so
(II) Module extmod: vendor="X.Org Foundation"
    compiled for 1.6.0, module version = 1.0.0
    Module class: X.Org Server Extension
    ABI class: X.Org Server Extension, version 2.0
(II) Loading extension MIT-SCREEN-SAVER
(II) Loading extension XFree86-VidModeExtension
(II) Loading extension XFree86-DGA
(II) Loading extension DPMS
(II) Loading extension XVideo
(II) Loading extension XVideo-MotionCompensation
(II) Loading extension X-Resource
(II) LoadModule: "dbe"
(II) Loading /usr/lib/xorg/modules/extensions//libdbe.so
(II) Module dbe: vendor="X.Org Foundation"
    compiled for 1.6.0, module version = 1.0.0
    Module class: X.Org Server Extension
    ABI class: X.Org Server Extension, version 2.0
(II) Loading extension DOUBLE-BUFFER
(II) LoadModule: "glx"
(II) Loading /usr/lib/xorg/modules/extensions//libglx.so
(II) Module glx: vendor="FireGL - ATI Technologies Inc."
    compiled for 7.4.0, module version = 1.0.0
(II) Loading extension GLX
(II) LoadModule: "record"
(II) Loading /usr/lib/xorg/modules/extensions//librecord.so
(II) Module record: vendor="X.Org Foundation"
    compiled for 1.6.0, module version = 1.13.0
    Module class: X.Org Server Extension
    ABI class: X.Org Server Extension, version 2.0
(II) Loading extension RECORD
(II) LoadModule: "dri"
(II) Loading /usr/lib/xorg/modules/extensions//libdri.so
(II) Module dri: vendor="X.Org Foundation"
    compiled for 7.4.0, module version = 1.0.0
(II) Loading extension XFree86-DRI
(II) Loading sub module "fglrxdrm"
(II) LoadModule: "fglrxdrm"
(II) Loading /usr/lib/xorg/modules/linux//libfglrxdrm.so
(II) Module fglrxdrm: vendor="FireGL - ATI Technologies Inc."
    compiled for 1.4.99.906, module version = 8.65.4
(II) LoadModule: "dri2"
(II) Loading /usr/lib/xorg/modules/extensions//libdri2.so
(II) Module dri2: vendor="X.Org Foundation"
    compiled for 1.6.0, module version = 1.0.0
    ABI class: X.Org Server Extension, version 2.0
(II) Loading extension DRI2
(II) LoadModule: "fglrx"
(II) Loading /usr/lib/xorg/modules/drivers//fglrx_drv.so
(II) Module fglrx: vendor="FireGL - ATI Technologies Inc."
    compiled for 1.4.99.906, module version = 8.65.4
    Module class: X.Org Video Driver
(II) Primary Device is: PCI 02@00:00:0
(WW) Falling back to old probe method for fglrx
(II) ATI Proprietary Linux Driver Version Identifier:8.65.4
(II) ATI Proprietary Linux Driver Release Identifier: 8.65                     
           
(II) ATI Proprietary Linux Driver Build Date: Aug 13 2009 21:15:30
(II) Loading PCS database from /etc/ati/amdpcsdb
(WW) fglrx: No matching Device section for instance (BusID PCI:0@1:5:0) found
(WW) fglrx: No matching Device section for instance (BusID PCI:0@2:0:0) found
(EE) No devices detected.

Fatal server error:
no screens found

Please consult the The X.Org Foundation support
     at http://wiki.x.org
for help.
Please also check the log file at "/var/log/Xorg.0.log" for additional informati
on.

ddxSigGiveUp: Closing log


lspciの出力です。
00:00.0 Host bridge: Advanced Micro Devices [AMD] RS780 Host Bridge
00:01.0 PCI bridge: Advanced Micro Devices [AMD] RS780 PCI to PCI bridge (int gf
x)
00:03.0 PCI bridge: Advanced Micro Devices [AMD] RS780 PCI to PCI bridge (ext gf
x port 1)
00:07.0 PCI bridge: Advanced Micro Devices [AMD] RS780 PCI to PCI bridge (PCIE p
ort 3)
00:11.0 SATA controller: ATI Technologies Inc SB700/SB800 SATA Controller [IDE m
ode]
00:12.0 USB Controller: ATI Technologies Inc SB700/SB800 USB OHCI0 Controller
00:12.1 USB Controller: ATI Technologies Inc SB700 USB OHCI1 Controller
00:12.2 USB Controller: ATI Technologies Inc SB700/SB800 USB EHCI Controller
00:13.0 USB Controller: ATI Technologies Inc SB700/SB800 USB OHCI0 Controller
00:13.1 USB Controller: ATI Technologies Inc SB700 USB OHCI1 Controller
00:13.2 USB Controller: ATI Technologies Inc SB700/SB800 USB EHCI Controller
00:14.0 SMBus: ATI Technologies Inc SBx00 SMBus Controller (rev 3a)
00:14.1 IDE interface: ATI Technologies Inc SB700/SB800 IDE Controller
00:14.2 Audio device: ATI Technologies Inc SBx00 Azalia (Intel HDA)
00:14.3 ISA bridge: ATI Technologies Inc SB700/SB800 LPC host controller
00:14.4 PCI bridge: ATI Technologies Inc SBx00 PCI to PCI Bridge
00:14.5 USB Controller: ATI Technologies Inc SB700/SB800 USB OHCI2 Controller
00:18.0 Host bridge: Advanced Micro Devices [AMD] Family 10h [Opteron, Athlon64,
Sempron] HyperTransport Configuration
00:18.1 Host bridge: Advanced Micro Devices [AMD] Family 10h [Opteron, Athlon64,
Sempron] Address Map
00:18.2 Host bridge: Advanced Micro Devices [AMD] Family 10h [Opteron, Athlon64,
Sempron] DRAM Controller
00:18.3 Host bridge: Advanced Micro Devices [AMD] Family 10h [Opteron, Athlon64,
Sempron] Miscellaneous Control
00:18.4 Host bridge: Advanced Micro Devices [AMD] Family 10h [Opteron, Athlon64,
Sempron] Link Control
01:05.0 VGA compatible controller: ATI Technologies Inc Radeon HD 3300 Graphics
01:05.1 Audio device: ATI Technologies Inc RS780 Azalia controller
02:00.0 VGA compatible controller: ATI Technologies Inc RV770 [Radeon HD 4850]
02:00.1 Audio device: ATI Technologies Inc HD48x0 audio
03:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI E
xpress Gigabit Ethernet controller (rev 02)
04:06.0 Multimedia controller: ViXS Systems, Inc. XCode II Series