Amigo editaste el xorg.con??? eso es indispensable en las tarjetas intel, yo tengo la misma tarjeta y me va de lujo, mira lo que tienes que hacer es lo siguiente, en consola teclea:
Asi abres el archov de configuracion de las X.

Ahora verifica y agrega lo siguiente>

En la sección Module agrega si no esta:

En la sección de la tarjeta de video cambia el driver "vesa" por "i810"
...

He intentado seguir tus pasos pero no me sale nada de eso (o eso creo):

# 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 "InputDevice"
   Identifier   "Generic Keyboard"
   Driver      "kbd"
   Option      "CoreKeyboard"
   Option      "XkbRules"   "xorg"
   Option      "XkbModel"   "pc105"
   Option      "XkbLayout"   "es"
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"
   Identifier   "Synaptics Touchpad"
   Driver      "synaptics"
   Option      "SendCoreEvents"   "true"
   Option      "Device"      "/dev/psaux"
   Option      "Protocol"      "auto-dev"
   Option      "HorizEdgeScroll"   "0"
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   "Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller"
   Driver      "intel"
   BusID      "PCI:0:2:0"
EndSection

Section "Monitor"
   Identifier   "Monitor genérico"
   Option      "DPMS"
EndSection

Section "Screen"
   Identifier   "Default Screen"
   Device      "Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller"
   Monitor      "Monitor genérico"
   DefaultDepth   24
   SubSection "Display"
      Modes      "1440x900"
   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"
   InputDevice   "Synaptics Touchpad"
EndSection

Que he de hacer?