[ubuntu] My laptop freezes when I switch from AC to battery

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http://ubuntuforums.org – My Toshiba A205 freezes when I switch the power from AC to battery on Lucid and Karmic. I've tried to run live Knoppix with kernel 2.6.32-17 but it doesn't work. I did the same with live Hardy 2.6.24 and it works perfect. Can somebody help me to solve the problem!:( (Hardware)