Basta che editi l'xorg.conf così:

codice:
# 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 xorg.conf manual page.
# (Type "man 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"
EndSection

Section "Module"
	Load		"glx"
EndSection

Section "InputDevice"
	Identifier	"Generic Keyboard"
	Driver		"kbd"
	Option		"CoreKeyboard"
	Option		"XkbRules"	"xorg"
	Option		"XkbModel"	"pc105"
	Option		"XkbLayout"	"it"
	Option		"XkbOptions"	"lv3:ralt_switch"
EndSection

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

Section "InputDevice"
	Driver		"wacom"
	Identifier	"stylus"
	Option		"Device"	"/dev/input/wacom"
	Option		"Type"	"stylus"
	Option		"ForceDevice"	"ISDV4"# Tablet PC ONLY
EndSection

Section "InputDevice"
	Driver		"wacom"
	Identifier	"eraser"
	Option		"Device"	"/dev/input/wacom"
	Option		"Type"	"eraser"
	Option		"ForceDevice"	"ISDV4"# Tablet PC ONLY
EndSection

Section "InputDevice"
	Driver		"wacom"
	Identifier	"cursor"
	Option		"Device"	"/dev/input/wacom"
	Option		"Type"	"cursor"
	Option		"ForceDevice"	"ISDV4"# Tablet PC ONLY
EndSection

Section "Device"
	Identifier	"nVidia Corporation G80 [GeForce 8600 GT]"
	Driver		"nvidia"
	Busid		"PCI:1:0:0"
	Option		"AddARGBVisuals"	"True"
	Option		"AddARGBGLXVisuals"	"True"
	Option		"NoLogo"	"True"
EndSection

Section "Monitor"
	Identifier	"Acer AL707"
	Horizsync	30.0	-	83.0
	Vertrefresh	55.0	-	75.0
	Option		"DPMS"
EndSection

Section "Screen"
	Identifier	"Default Screen"
	Device		"nVidia Corporation G80 [GeForce 8600 GT]"
	Monitor		"Acer AL707"
	Defaultdepth	24
	SubSection "Display"
		Depth	24
		Modes		"1280x1024"
	EndSubSection
EndSection

Section "ServerLayout"
	Identifier	"Default Layout"
  screen "Default Screen"
	Inputdevice	"Generic Keyboard"
	Inputdevice	"Configured Mouse"
	
	# Uncomment if you have a wacom tablet
	#	InputDevice     "stylus"	"SendCoreEvents"
	#	InputDevice     "cursor"	"SendCoreEvents"
	#	InputDevice     "eraser"	"SendCoreEvents"
EndSection


Section "Extensions"
	Option		"Composite"	"Enable"
EndSection
E dovrebbe andare, almeno io ho risolto così quando avevo l'nvidia (ora con l'integrata intel vado ch'è na meraviglia )