I experience this issue as well on my desktop computer (shuttle xpc) since I 
recently installed a gfx-card with two digital outputs for a xinerama-setup and 
activated the nvidia-current driver. Before that I was using the internal 
graphics of my core i5 where everything worked fine (except that I couldn't 
connect my second monitor).
Now with the nvidia-driver, waking-up from suspend takes > 30s. First, the 
screen is black showing only the mouse pointer, which freezes repeatedly. Next, 
the mouse moves normally but it still takes several seconds until the 
locking-screen comes up. After unlocking, the unity bar shows colored noise 
until I hover over it which redraws it to its normal state.

Hope this will get fixed soon.

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https://bugs.launchpad.net/bugs/828761

Title:
  Resume from suspend takes much more time when nvidia-current driver is
  installed.

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