I should point out that I'm running Dapper beta on an x86 machine, if that makes any difference.

Here's the output of /usr/sbin/ddcprobe:

paul@ubuntu:~$ sudo /usr/sbin/ddcprobe
Password:
vbe: VESA 2.0 detected.
oem: ATI RADEON 9200
memory: 16384kb
mode: 800x600x16
mode: 1024x768x16
mode: 320x200x32k
mode: 320x200x64k
mode: 320x200x16m
mode: 1600x1200x256
mode: 640x400x256
mode: 640x480x256
mode: 640x480x32k
mode: 640x480x64k
mode: 640x480x16m
mode: 1600x1200x32k
mode: 800x600x256
mode: 800x600x32k
mode: 800x600x64k
mode: 800x600x16m
mode: 1600x1200x64k
mode: 1024x768x256
mode: 1024x768x32k
mode: 1024x768x64k
mode: 1024x768x16m
mode: 1280x1024x256
mode: 1280x1024x32k
mode: 1280x1024x64k
mode: 1280x1024x16m
mode: 132x25 (text)
mode: 132x43 (text)
edid:
edid: 1 1
id: d569
eisa: AOCd569
serial: 04cd2c99
manufacture: 5 1998
input: sync on green, analog signal.
screensize: 28 21
gamma: 2.600000
dpms: RGB, active off, suspend, standby
timing: 640x480@60 Hz (VGA)
timing: 640x480@75 Hz (VESA)
timing: 800x600@60 Hz (VESA)
timing: 800x600@75 Hz (VESA)
timing: 1024x768@75 Hz (VESA)
ctiming: 640x480@85
ctiming: 800x600@85
ctiming: 1024x768@85
dtiming: 640x480@85
dtiming: 800x600@85
dtiming: 1280x1024@70
dtiming: 800x600@85

Here's the /etc/xorg.conf file:


# /etc/X11/xorg.conf (xorg X Window System server configuration file)
#
# This file was generated by dexconf, the Debian X Configuration tool, using
# values from the debconf database.
#
# Edit this file with caution, and see the /etc/X11/xorg.conf manual page.
# (Type "man /etc/X11/xorg.conf" at the shell prompt.)
#
# This file is automatically updated on xserver-xorg package upgrades *only*
# if it has not been modified since the last upgrade of the xserver-xorg
# package.
#
# If you have edited this file but would like it to be automatically updated
# again, run the following command:
#   sudo dpkg-reconfigure -phigh xserver-xorg

Section "ServerLayout"
	Identifier     "Default Layout"
	Screen      0  "aticonfig Screen 0" 0 0
	InputDevice    "Generic Keyboard"
	InputDevice    "Configured Mouse"
	InputDevice    "stylus" "SendCoreEvents"
	InputDevice    "cursor" "SendCoreEvents"
	InputDevice    "eraser" "SendCoreEvents"
EndSection

Section "Files"

	# path to defoma fonts
	FontPath     "/usr/share/X11/fonts/misc"
	FontPath     "/usr/share/X11/fonts/cyrillic"
	FontPath     "/usr/share/X11/fonts/100dpi/:unscaled"
	FontPath     "/usr/share/X11/fonts/75dpi/:unscaled"
	FontPath     "/usr/share/X11/fonts/Type1"
	FontPath     "/usr/share/X11/fonts/100dpi"
	FontPath     "/usr/share/X11/fonts/75dpi"
	FontPath     "/var/lib/defoma/x-ttcidfont-conf.d/dirs/TrueType"
EndSection

Section "Module"
	Load  "i2c"
	Load  "bitmap"
	Load  "ddc"
	Load  "dri"
	Load  "extmod"
	Load  "freetype"
	Load  "glx"
	Load  "int10"
	Load  "type1"
	Load  "vbe"
EndSection

Section "InputDevice"
	Identifier  "Generic Keyboard"
	Driver      "kbd"
	Option	    "CoreKeyboard"
	Option	    "XkbRules" "xorg"
	Option	    "XkbModel" "pc104"
	Option	    "XkbLayout" "us"
EndSection

Section "InputDevice"
	Identifier  "Configured Mouse"
	Driver      "mouse"
	Option	    "CorePointer"
	Option	    "Device" "/dev/input/mice"
	Option	    "Protocol" "ExplorerPS/2"
	Option	    "ZAxisMapping" "4 5"
	Option	    "Emulate3Buttons" "true"
EndSection

Section "InputDevice"

                                                      # /dev/input/event
                                                      # for USB
	Identifier  "stylus"
	Driver      "wacom"
	Option	    "Device" "/dev/wacom"          # Change to 
	Option	    "Type" "stylus"
	Option	    "ForceDevice" "ISDV4"               # Tablet PC ONLY
EndSection

Section "InputDevice"

                                                      # /dev/input/event
                                                      # for USB
	Identifier  "eraser"
	Driver      "wacom"
	Option	    "Device" "/dev/wacom"          # Change to 
	Option	    "Type" "eraser"
	Option	    "ForceDevice" "ISDV4"               # Tablet PC ONLY
EndSection

Section "InputDevice"

                                                      # /dev/input/event
                                                      # for USB
	Identifier  "cursor"
	Driver      "wacom"
	Option	    "Device" "/dev/wacom"          # Change to 
	Option	    "Type" "cursor"
	Option	    "ForceDevice" "ISDV4"               # Tablet PC ONLY
EndSection

Section "Monitor"
	Identifier   "Generic Monitor"
	HorizSync    28.0 - 51.0
	VertRefresh  43.0 - 60.0
	Option	    "DPMS"
EndSection

Section "Monitor"
	Identifier   "aticonfig Monitor 0"
EndSection

Section "Device"
	Identifier  "Intel Corporation 82845G/GL[Brookdale-G]/GE Chipset Integrated Graphics Device"
	Driver      "i810"
	BusID       "PCI:0:2:0"
EndSection

Section "Device"
	Identifier  "ATI Graphics Adapter 0"
	Driver      "fglrx"
	Option	    "(null)"
	Option	    "VideoOverlay" "on"
	Option	    "OpenGLOverlay" "off"
	BusID       "PCI:1:9:0"
EndSection

Section "Screen"
	Identifier "Default Screen"
	Device     "Intel Corporation 82845G/GL[Brookdale-G]/GE Chipset Integrated Graphics Device"
	Monitor    "Generic Monitor"
	DefaultDepth     24
	SubSection "Display"
		Depth     1
		Modes    "1024x768" "800x600" "640x480"
	EndSubSection
	SubSection "Display"
		Depth     4
		Modes    "1024x768" "800x600" "640x480"
	EndSubSection
	SubSection "Display"
		Depth     8
		Modes    "1024x768" "800x600" "640x480"
	EndSubSection
	SubSection "Display"
		Depth     15
		Modes    "1024x768" "800x600" "640x480"
	EndSubSection
	SubSection "Display"
		Depth     16
		Modes    "1024x768" "800x600" "640x480"
	EndSubSection
	SubSection "Display"
		Depth     24
		Modes    "1024x768" "800x600" "640x480"
	EndSubSection
EndSection

Section "Screen"
	Identifier "aticonfig Screen 0"
	Device     "ATI Graphics Adapter 0"
	Monitor    "aticonfig Monitor 0"
	DefaultDepth     24
	SubSection "Display"
		Viewport   0 0
		Depth     24
	EndSubSection
EndSection

Section "DRI"
	Mode         0666
EndSection

I'm using an ATI Radeon 9250 (PCI) with 256MB RAM and an AOC Spectrum 5VIr monitor. This motherboard also has an onboard video chip which I am not using and should be disabled.