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[Nigel Harrison <nigel.harrison100@xxxxxxxxx>]

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

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  It seems #1303736 is Not fixed.

  Black screen on resume when using standby on close lid is confirmed on
  Dell Latitude D400 on completely new install of Xubuntu 14.04.1 32
  bit. downloaded 14 Aug from repository as a .ISO image.

  This despite claims to the contrary on the website.
  http://xubuntu.org/news/xubuntu-14-04-1-released/ pointing to
  https://bugs.launchpad.net/ubuntu/+source/xubuntu-default-
  settings/+bug/1303736

  Using the "Suspend" key results in correct operation, i.e. the laptop
  suspends and resumes correctly on lid open. Suspending by closing the
  laptop lid results in the black screen when re-opening. Once in black
  screen mode, the only recourse is power off re-boot.

  Although power manager is set correctly to "Suspend" in the power
  manager , on closing the lid the system does NOT appear to suspend as
  it does when the "Log-off Suspend" button is clicked or the hardware
  "Suspend" key is pressed i.e. the problem APPEARS to be on lid close.

  Power manager and light-locker set NOT to lock on suspend or shutdown
  makes no difference to behaviour.

  Xubuntu up to 12.04.4 (plus latest updates) worked absolutely
  correctly before new install of 14.04.1

  This is a MAJOR inconvenience for an upgrade of an LTS.

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