I don't know if this is useful, but I am experiencing the blank screen + moving 
cursor + high CPU ussage + locked keyboard problem.
I am running 12.04 AMD64 with propietary Nvidia graphic drivers. 
Suspend and Resume work FINE if I use Unity 2D or Gnome Classic (no effects). 
It does show the problem with Unity, Gnome Shell, Gnome Classic, and Cinnamon. 
In all of these the var/usr/pm-suspend.log shows the resume from suspend 
worked. I think the problem is in Compiz (at least in my case).
My computer used to resume and suspend with no problem with Maverick.

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https://bugs.launchpad.net/bugs/966744

Title:
  Resume from suspend leaves me with black screen or a screen of the
  desktop before it suspended (though the mouse still moves/changes
  cursor)

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