This looks like a similar bug report: 
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1324935
There is a workaround identified here as adding the following to the kernel 
cmdline: linemodeset=0 video.allow_duplicates=1
In addition it seems like v3.9 and older kernels could potentially work meaning 
this could be a regression.

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https://bugs.launchpad.net/bugs/1315369

Title:
  Log in not available after lock screen with multi-monitor

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