Comment 61 for bug 1283938

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)
...