I notice a very similar issue on a fresh install of Xubuntu 14.04 on a Dell 
Inspiron: 
I'm noticing issues with putting the laptop to Suspend. Whether I do it from 
xfce4-session-logout or from xfce4-power-manager, the laptop will hang on 
attempting to Suspend, when I hit the power button the laptop shuts down, when 
I restart
there is the "Report a problem" wizard which reports that the laptop failed to 
resume properly from suspend.

HOWEVER, the awkward issue is that when I do Suspend from within LightDM
it works fine (doesn't hang _and_ resumes fine). Also, `sudo pm-suspend`
works, too, without a glitch.

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https://bugs.launchpad.net/bugs/1303736

Title:
  Black screen after login from suspend in Xubuntu 14.04

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