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dual desktop probleme resolution ecran 16/9

Bonjour,
Je suis en dual desktop avec un HP nx8220 et un ecran 17" Samsung SyncMaster710v.
L'ecran 17" est en 1024x768 et c'est impeccable. Le portable ecran 16/9 est aussi en 1024x768.
Ca fonctionne bien mais j'aimerais mettre en resolution sur l'ecran du portable (16/9) 1280x768. Or lorsque je mets cette resolution j'ai à l'ecran deux fois certaines parties du bureau et c'est donc inutilisable.
Quelqu'un aurait-il une idée?
Merci.
ci dessous la partie de xorg.conf concernée:

Section "Device"
	Identifier	"0 ATI Technologies, Inc. M24 1P [Radeon Mobility X600]"
	Driver		"ati"
	Screen 0
	BusID		"PCI:1:0:0"
	Option		"UseFBDev"		"true"
EndSection

Section "Device"
	Identifier	"1 ATI Technologies, Inc. M24 1P [Radeon Mobility X600]"
	Driver		"ati"
	Screen 1
	BusID		"PCI:1:0:0"
	Option		"UseFBDev"		"true"
EndSection

Section "Monitor"
	Identifier	"Monitor0"
	Option		"DPMS"
	HorizSync	28-64
	VertRefresh	43-60
	Option          "DPMS"
EndSection

Section "Monitor"
	Identifier	"Monitor1"
	Option		"DPMS"
	HorizSync	28-64
	VertRefresh	50-160
	Option          "DPMS"
EndSection

Section "Screen"
	Identifier	"Screen0"
	Device		"0 ATI Technologies, Inc. M24 1P [Radeon Mobility X600]"
	Monitor		"Monitor0"
	DefaultDepth    24
        SubSection "Display"
		Depth		16
		Modes		"1280x1024" "1152x864" "1024x768" "800x600"
	EndSubSection
	SubSection "Display"
		Depth		24
		Modes		"1280x1024" "1152x864" "1024x768" "800x600"
	EndSubSection
EndSection

Section "Screen"
	Identifier	"Screen1"
	Device		"1 ATI Technologies, Inc. M24 1P [Radeon Mobility X600]"
	Monitor		"Monitor1"
	DefaultDepth    24
        SubSection "Display"
		Depth		16
		Modes		"1280x1024" "1152x864" "1024x768" "800x600"
	EndSubSection
	SubSection "Display"
		Depth		24
		Modes		"1280x1024" "1152x864" "1024x768" "800x600"
	EndSubSection
EndSection

Section "ServerLayout"
	Identifier      "Default layout"
        Screen 0        "Screen0"
        Screen 1        "Screen1" LeftOf "Screen0"
	InputDevice	"Generic Keyboard"
	InputDevice	"Configured Mouse"
	InputDevice     "stylus" "SendCoreEvents"
	InputDevice     "cursor" "SendCoreEvents"
	InputDevice     "eraser" "SendCoreEvents"
	InputDevice	"Synaptics Touchpad"
EndSection

Section "DRI"
	Mode	0666
EndSection

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Raph
Ubuntu Lucid sur HPnx8220