dell vostro 3500 will no longer suspend after upgrade to 12.04

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http://askubuntu.com – In 11.10 I was able to suspend this laptop with no issues. No when I click suspend in the status menu, the screen clears and it "feels like" it is going to suspend, but then it wakes up immediately (to a locked screen -- I'm asked for passwd). Googling hasn't produced anything useful, so I'm asking here... (HowTos)