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[ubuntu] 12.04 - Suspend now crashes PC on lid-close

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http://ubuntuforums.org – Using Ubuntu 12.04 on Dell Precision M6400, I have started to get odd results when I close the lid to try to suspend. Up to a few weeks ago this worked fine, however now it just crashes the PC and a full reboot is required to get control. However, if I select Shut Down | Suspend from the menu, the suspend works properly and I can unsuspend by raising the lid again. Can anyone please suggest what might be causing this annoying glitch ? I suspect a recent update has broken this, but can't tie it down to any particular date or package. Tks for any suggestions.GB. (Hardware)