I found a posible solution for this bug at:
https://bugs.launchpad.net/ubuntu/+bug/341094
I have a DELL VOSTRO 1510, and add "i8042.reset i8042.nomux i8042.nopnp
i8042.noloop" to boot parameters in GRUB.
this work fine for my up to now. (two days).
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[jaunty] Keyboard and Mouse Frozen on Login Screen
https://bugs.launchpad.net/bugs/335297
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