VMware Full Screen mode does not work?

If you have the message like this,

Unable to find an appropriate host video mode.
Adding the guest mode to the 'display' subsection of the 'screen' section of your /etc/X11/XF86Config and restarting X is likely to help.

Failed to switch to full screen SVGA mode.

when you change the guest OS to the full screen mode using VMware console, and failed. And if you have tried to add some resolution to your xorg.conf but not work, try add the "extmod" at "Module" section of /etc/X11/xorg.conf. I solved this problem in this way.
(My Linux Environment is CentOS 4.5, Linux kernel 2.6.9, X Window System Version 6.8.2.)

Following my xorg.conf is working well.

Good luck.

# Xorg configuration created by system-config-display

Section "ServerLayout"
	Identifier	"Multihead layout"
	Screen	0	"Screen0" 0 0
	InputDevice	"Keyboard0" "CoreKeyboard"
	InputDevice	"Mouse0" "CorePointer"
EndSection

Section "Files"
#	ModulePath	"/usr/X11R6/lib64/modules"
	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" "jp106"
	Option		"XkbLayout" "jp"
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	"Monitor 1280x1024"
#	HorizSync	31.5 - 79.0
#	VertRefresh	50.0 - 90.0
	Option		"DPMS" "true"
EndSection

Section "Device"
        Identifier	"Videocard0"
        Driver		"fglrx"
	BoardName	"ATI Technologies Inc RS482 [Radeon Xpress 200M]"
	BusID		"PCI:1:5:0"
	Option		"VideoOverlay"  "on"
	Option		"DesktopSetup"  "clone"
	Option		"Centermode"    "on"
#	Option		"ForceMonitors" "notv"
#	Option		"PseudoColorVisuals" "off"
#	Option		"OpenGLOverlay" "off"
EndSection

Section "Screen"
	Identifier	"Screen0"
	Device		"Videocard0"
	Monitor		"Monitor0"
	DefaultDepth	24
	SubSection	"Display"
		Viewport	0 0
		Virtual		1280 1024
		Depth		24
		Modes		"1280x1024" "1280x960" "1280x800" "800x600" "640x480"
	EndSubSection
EndSection

#Section "DRI"
#	Group		0
#	Mode		0666
#EndSection

Section "ServerFlags"
	Option		"AIGLX" "off"
EndSection

Section "Extensions"
	Option		"Composite" "Disable"
EndSection