For me killing unity-panel-service as a last resort doesn't work (anymore).
I am sometimes, but not always, lucky by preforming these voodoo steps:
1) switch to a VT (text terminal, e.g. CTRL-ALT-F1), log in and type "startx".
2) It starts another X session, and asks for a password ("authentication is
required to change your own userdata"). Just press ESC a few times, and you end
up with an empty, unusable desktop. You can't do much here.
3) Now switch back to the VT (again CTRL-ALT-F1) and press CTRL-C, which kills
the new X session.
4) press CTRL-ALT-F7 to switch back to the original (black-screen) X session,
which hopefully snapped out of blackness by the above steps.
This bug is causing data loss much of the time, as it prevents accessing
all your open apps and documents after suspending/resuming.
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https://bugs.launchpad.net/bugs/1418295
Title:
Black screen after resuming from suspend
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