I confirm this bug.
My config: ibm thinkpad R61 - core2duo - nvidia quadro m140
top - 08:56:35 up 23 min, 2 users, load average: 0.89, 1.06, 0.75
Tasks: 132 total, 2 running, 130 sleeping, 0 stopped, 0 zombie
Cpu(s): 43.4%us, 0.6%sy, 0.0%ni, 55.9%id, 0.0%wa, 0.1%hi, 0.1%si, 0.0%st
Mem: 2062040k total, 789940k used, 1272100k free, 15948k buffers
Swap: 1992052k total, 0k used, 1992052k free, 394704k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
5786 root 20 0 917m 45m 9.8m R 83 2.3 11:23.74 Xorg
6321 mangus 20 0 253m 41m 14m S 3 2.0 0:29.22 compiz.real
6796 mangus 20 0 213m 24m 14m S 1 1.2 0:09.50 gnome-system-mo
6812 mangus 20 0 253m 24m 11m S 0 1.2 0:00.54 gnome-terminal
6854 mangus 20 0 577m 86m 27m S 0 4.3 0:36.28 firefox
1 root 20 0 4016 892 600 S 0 0.0 0:00.92 init
** Attachment added: "xorg.conf"
http://launchpadlibrarian.net/13848226/xorg.conf
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[Hardy] Xorg high CPU usage with 2.6.24 kernel and nvidia-glx
https://bugs.launchpad.net/bugs/178400
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