Same problem on a Lenovo Thinkpad T420s with an install of 64bit Xubuntu
14.04.  After suspending and unsuspending, I get a password prompt.
After successfully authenticating, the screen goes black.

$ lshw
...
        *-display
             description: VGA compatible controller
             product: 2nd Generation Core Processor Family Integrated Graphics 
Controller
             vendor: Intel Corporation
             physical id: 2
             bus info: pci@0000:00:02.0
             version: 09
             width: 64 bits
             clock: 33MHz
             capabilities: msi pm vga_controller bus_master cap_list rom
             configuration: driver=i915 latency=0
             resources: irq:49 memory:f0000000-f03fffff 
memory:e0000000-efffffff ioport:4000(size=64)
...

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https://bugs.launchpad.net/bugs/1283938

Title:
  Ubuntu 14.04 blank screen after wakeup from sleep

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