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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