I think I see the problem on an X230 with Intel graphics and a SSD.   Does 
black screen mean text login screen?  I get that more often than the low 
graphics messages.
When I get the text login and look at the Xorg log I see the X server failed to 
start with the following error:
(EE) intel(0): [drm] Failed to open DRM device for pci:0000:00:02.0: No such 
file or directory

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https://bugs.launchpad.net/bugs/1070150

Title:
  Intermittent black screen or low graphics mode message

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