[ubuntu] IBM G40 laptop screen goes blank

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http://ubuntuforums.org – Running Ubuntu 8.4.4 on an IBM G40 P4 3.0 with 512 etc... No problems other than one.....When I'm using the OS in any state and I close the lid and lift it back up the screen goes blank and nothing I try will bring it back. The only way to get back to my OS is to do a dirty shutdown and restart and hope that I'm not dumb enough to close the screen. Is this a setting issue with my IBM (bios) or with my OS (Ubuntu)?? Thanks for the advice.. (Hardware)