Mouse trail after coming out of hibernation, Ubuntu 9.10

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http://www.linuxquestions.org – Everything is normal until I put my laptop into hibernation. On waking up, it seems to resume OK except the cursor arrow is surrounded by a square black box which gradually obliterates the screen as the mouse is moved around. The only option is then to restart Ubuntu. I have been unable to find anything relevant using the search facility. Can anyone suggest a solution please? (HowTos)