Ubuntu 8.10 on Thinkpad T43 Screen Freezes

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Last week, I installed the new version of Ubuntu 8.10 on my notebook.
After logging into the system, OS works fine about 5-10 minutes and later it freezes suddenly.
As far as I see the problem was related with my graphics card and when I disabled "compiz" functionality(since I was using Xubuntu, this option will not be a problem) everything started to work seamlessly.

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