[ubuntu] can't use my kyeborad to re-enter ubunte

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http://ubuntuforums.org – hi everyone. i have problem with ubuntu 9.10 which happen when i suspend or put it in sleep my laptop. after a awake my laptop i can not use the keyboard and type my password to re-enter the system SO I NEED TO RE-START even if use the keyboard on the screen i could not type in my keyboard after i enter the system. could you pleas help * the same problem happen to2 of my friends. * my laptop is sony vaio VGN-CS11SQ thanks (Hardware)