It seems like an FGLRX issue to me, your LightdmDisplayLog.txt includes these
line:
(EE) Failed to load module "fglrx" (module does not exist, 0)
(II) [KMS] Kernel modesetting enabled.
ddxSigGiveUp: Closing log
Does going to a terminal and re-installing fglrx help?
** Also affects: fglrx-installer (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/962601
Title:
Login into unity shows nothing
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