hey
didnt read all 9 sites of this thread - weird i dontknow if the mouse problem is still active...
anyway i had the same prob and i enter following kernel flag to my boot.plist:

<key>Kernel Flags</key>
<string>idlehalt=0</string>

thats all
never had any bad mouse issue again

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is it possible that only amd dual cores have this problem?
would be an explanation for that, coz win xp needs the amd dual core optimitzer for running fine.
and coz there is certainly no mac verison of the optimizer the second core should or should not interact in idle.
hmm sounds logically, anyway the kernel flag works for me


cheers