I believe this is more than just an xubuntu issue or a laptop one in 14.04. I  
run a desktop with stock ubuntu and unity, 12.04.4 fully upated via the 
repositories with no foreign drivers for the graphics. ie nouveau as supplied 
in the original install and updated only via normal updates if nouveau has ever 
been updated in 12.04.  The graphics card is Nvidia at least 3 years old and 
certainly not one of the esoteric ones, probably close to the bottom of the 
nvidia range.  Suspend resume works perfectly.
On setting up 14.04  for testing on the same hardware with the exception that 
14.04 is on an hd whereas 12.04 is on an ssd, it would not resume with the 
keyboard and mouse hanging alternatively and never being able to get back to an 
operating desktop. I went as far as doing a suspend from a real terminal using 
pm-suspend. I could revert to the terminal but still not the desktop.  My 
rudimentary testing indicates its a nouveau driver issue.  I tried the 12.04 
kernel on the 14.04 but to no effect. I installed the nvidia binary and hey 
presto suspend resume works. As Linus says nouveau driver taints the kernel!! 
At the moment the relevant desktop is out of action but a I can resurrect it 
should you require some log/error report dumps as specified by you.

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https://bugs.launchpad.net/bugs/1357090

Title:
  Black screen on resume in Xubuntu 14.04.1

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