I had the same problem but, following some clues from the comments in this bug, 
have found a fix.
I had disabled Power Management in System Settings -> Startup and Shutdown -> 
Service Manager -> Startup Services.
Simply restarting the service immediately gave me back my Suspend buttons!

To restart the service 
- Select the Power Management service
- Enable the 'Use' checkbox
- Click the 'Start' button!! (the 'Status' should change to 'Running'  and your 
buttons should now be available)
- Click the 'Apply' button

Hope this works for you.

Some more system info ...
> upower -d
Daemon:
  daemon-version:  0.9.23
  can-suspend:     yes
  can-hibernate:   no
  on-battery:      no
  on-low-battery:  no
  lid-is-closed:   no
  lid-is-present:  no
  is-docked:       no
> uname -a
Linux marvin 3.13.0-24-generic #47-Ubuntu SMP Fri May 2 23:30:00 UTC 2014 
x86_64 x86_64 x86_64 GNU/Linux

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https://bugs.launchpad.net/bugs/1296133

Title:
  Suspend and hibernate missing from KMenu and Power Management in
  System settings

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