This issue still occurs for me under Nvidia Driver 185 in Ubuntu 9.10
See my lspci in bug 444179
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desktop effects could not be enabled
https://bugs.launchpad.net/bugs/417138
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This bug happens to me a few times a day as well. A restart of gdm seems
to temporarily fix the issue. (NVIDIA Driver version 185.18.36)
Seems to me like it could be related to bug 417138.
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HighCPU usage in X
https://bugs.launchpad.net/bugs/444179
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lscpi -vvnn content attached.
** Attachment added: "lspic.txt"
http://launchpadlibrarian.net/35113888/lspic.txt
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HighCPU usage in X
https://bugs.launchpad.net/bugs/444179
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ubuntu-b