With Gnome System Monitor 2.22 under Debian testing (Lenny) I had the problem when I clicked on the Resources tab the CPU usage would got to 100% on my laptop and desktop.

Well I have been able to fix the problem on my laptop which has and Intel video card by adding Option “AccelMethod” “EXA” to the Device section in my xorg.conf file.

Example:

Section "Device"
        Identifier      "Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller"
        Driver          "intel"
        BusID           "PCI:0:2:0"
        Option           "AccelMethod"  "EXA"
EndSection

When I have worked out how to fix the problem on my desktop using a Nvidia video card I will post the solution.

Thanks goes out to MistaED for pointing out to me that this a problem with the way Cairo rendering is done.

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Here is what i have added to my xorg.conf file to get cloned desktop working on my laptop.

In the
Section “Device”
……
EndSection

this is the extra i added

	Option		"MonitorLayout"		"CRT,LFP"
	Option		"Clone"			"True"
	Option		"DevicePresence"	"True"
	Option		"VBERestore"		"True"
	BusID		"PCI:0:2:0"

Remember before playing with your xorg.conf file to back it up

sudo cp /etc/X11/xorg.conf /etc/X11/xorg.conf.backup

To see my xorg.conf file
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