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alguien que haya instalado ubuntu en una "macbook de las primeras que salieron " "no las core2!!!" y tenga la configuracion para extender escritorio me podria ayudar ya que he probado y no me resulta los cambios que realizo siguiendo los paso de la wiki.

yo cree un backup del xorg lo hice asi
sudo cp -p /etc/X11/xorg.conf /etc/X11/xorg.conf~

despues hice sudoedit /etc/X11/xorg.conf

y copie y pegue esto

######################################################################
Section "ServerFlags"
Option "DefaultServerLayout" "Default Layout"
# Option "DefaultServerLayout" "MonitorLayout Layout"
# Option "DefaultServerLayout" "Clone Layout"
# Option "DefaultServerLayout" "Xinerama Layout"
EndSection
######################################################################
Section "Device"
Identifier "MonitorLayout Device"
Driver "i810"
BusID "PCI:0:2:0"
Option "MonitorLayout" "NONE,CRT+LFP"
EndSection

Section "Screen"
Identifier "MonitorLayout Screen"
Device "MonitorLayout Device"
Monitor "Color LCD"
DefaultDepth 24
SubSection "Display"
Depth 24
Modes "1280x800"
EndSubSection
EndSection

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

Section "Device"
Identifier "Clone Device"
Driver "i810"
BusID "PCI:0:2:0"
Option "MonitorLayout" "CRT,LFP"
Option "Clone"
EndSection

Section "Screen"
Identifier "Clone Screen"
Device "Clone Device"
Monitor "Color LCD"
DefaultDepth 24
SubSection "Display"
Depth 24
Modes "1280x800"
EndSubSection
EndSection

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

Section "Device"
Identifier "Xinerama Device"
Driver "i810"
BusID "PCI:0:2:0"
Screen 0
Option "MonitorLayout" "CRT,LFP"
EndSection

Section "Device"
Identifier "Xinerama Device (2)"
Driver "i810"
BusID "PCI:0:2:0"
Screen 1
Option "MonitorLayout" "CRT,LFP"
EndSection

Section "Screen"
Identifier "Xinerama Screen"
Device "Xinerama Device"
Monitor "Color LCD"
DefaultDepth 24
SubSection "Display"
Depth 24
Modes "1280x800"
EndSubSection
EndSection

Section "Screen"
Identifier "Xinerama Screen (2)"
Device "Xinerama Device (2)"
Monitor "Color LCD"
DefaultDepth 24
SubSection "Display"
Depth 24
Modes "1280x1024"
EndSubSection
EndSection

Section "ServerLayout"
Identifier "Xinerama Layout"
Screen "Xinerama Screen"
InputDevice "Generic Keyboard"
InputDevice "Configured Mouse"
InputDevice "stylus" "SendCoreEvents"
InputDevice "cursor" "SendCoreEvents"
InputDevice "eraser" "SendCoreEvents"
# RightOf LeftOf Above Below
Screen "Xinerama Screen (2)" LeftOf "Xinerama Screen"
Option "Xinerama"
EndSection

######################################################################

pudiste resolverlo?
en teoría tiene que funcionar así:
(cambiá sólo estas líneas)


esto habilitaría la opción de escritorio extendido. el resto del xorg habría que verlo, mientras tanto te recomiendo preguntar a este macubuntero http://magarto.com/blog/