[Linux-disciples] Xinerama troubles

[Stephen R Laniel]

I'm trying to get Xinerama running across my laptop and
desktop monitors. My boss already set up Xinerama to run
across two desktop monitors, and I know it's working, so I
just copied that portion of xorg.conf from his working
version. lspci suggests that there's just one video card on
my laptop; I assume that's the card that runs both the
laptop monitor and any monitors connected to the 15-pin
port.

Anyway, X.org is rendering two copies of my desktop, one on
each monitor; it's not doing Xinerama. Can anyone take a
look at the xorg.conf file below and suggest what the
trouble might be?

# /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 "Files"
	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/CID"
	FontPath	"/usr/share/X11/fonts/100dpi"
	FontPath	"/usr/share/X11/fonts/75dpi"
        # paths to defoma fonts
	FontPath	"/var/lib/defoma/x-ttcidfont-conf.d/dirs/TrueType"
	FontPath	"/var/lib/defoma/x-ttcidfont-conf.d/dirs/CID"
EndSection

Section "Module"
	Load	"GLcore"
#	Load	"bitmap"
	Load	"dbe"
	Load	"ddc"
	Load	"dri"
	Load	"extmod"
	Load	"freetype"
	Load	"glx"
	Load	"int10"
	Load	"record"
	Load	"type1"
	Load	"v4l"
	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"		"ImPS/2"
	Option		"Emulate3Buttons"	"true"
	Option		"ZAxisMapping"		"4 5"
EndSection

Section "InputDevice"
	Identifier	"Synaptics Touchpad"
	Driver		"synaptics"
	Option		"SendCoreEvents"	"true"
	Option		"Device"		"/dev/psaux"
	Option		"Protocol"		"auto-dev"
	Option		"HorizScrollDelta"	"0"
EndSection

Section "Device"
	Identifier	"ATI Technologies, Inc. Radeon Mobility 9000 (M7 LW)"
	Driver		"ati"
	BusID		"PCI:1:0:0"
EndSection

Section "Monitor"
	Identifier	"LaptopMonitor"
	Option		"DPMS"
EndSection

Section "Monitor"
	#DisplaySize	  380   300	# mm
	Identifier   "DesktopMonitor"
        VendorName   "Dell"
	ModelName    "E173FP"
	HorizSync    31.0 - 80.0
	VertRefresh  56.0 - 76.0
	Option       "DPMS"
EndSection

Section "Screen"
	Identifier	"LaptopScreen"
	Device		"ATI Technologies, Inc. Radeon Mobility 9000 (M7 LW)"
	Monitor		"LaptopMonitor"
	DefaultDepth	24
	SubSection "Display"
		Depth		1
		Modes		"1024x768"
	EndSubSection
	SubSection "Display"
		Depth		4
		Modes		"1024x768"
	EndSubSection
	SubSection "Display"
		Depth		8
		Modes		"1024x768"
	EndSubSection
	SubSection "Display"
		Depth		15
		Modes		"1024x768"
	EndSubSection
	SubSection "Display"
		Depth		16
		Modes		"1024x768"
	EndSubSection
	SubSection "Display"
		Depth		24
		Modes		"1024x768"
	EndSubSection
EndSection

Section "Screen"
	Identifier "DesktopScreen"
	Device    "ATI Technologies, Inc. Radeon Mobility 9000 (M7 LW)" 
	Monitor    "DesktopMonitor"
	DefaultColorDepth 24
	SubSection "Display"
		Depth     24
		Virtual   1280 1024
		Modes     "1280x1024"
	EndSubSection
EndSection

Section "ServerLayout"
	Identifier	"Multihead Layout"
	Screen		"LaptopScreen" 0 0
	Screen	"DesktopScreen" RightOf "LaptopScreen"
	InputDevice	"Generic Keyboard"
	InputDevice	"Configured Mouse"
	InputDevice	"Synaptics Touchpad"
EndSection

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

Section "DRI"
	Mode	0666
EndSection

-- 
Stephen R. Laniel
steve at laniels.org
+(617) 308-5571
http://laniels.org/
PGP key: http://laniels.org/slaniel.key
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