OK, so I think I haven't been totally clear in the description of this bug. 
Here is some clarification.
- If I do Suspend from the menu and power back on, it works
- If I lock the screen from the menu and unlocks it, it works
- If I close the lid of the laptop, the computer resumes and the username and 
password dialog appears. But after I have typed in my password, the screen goes 
black but the computer keeps working. If I restart lightdm, it works

To me this doesn't look like a suspend/resume bug at all.

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https://bugs.launchpad.net/bugs/1327110

Title:
  [Dell Latitude D420] Black screen after resuming from suspend

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