Since modesetting may play a part in making resume fail, I retried after 
switching the onboard Intel Q35 graphics of the HP dc7800p CMT to an Nvidia 
GT520.
Expectedly this has caused some changes to how the system behaves:
It will suspend once, stopping its fans - as well as usually respond to the 
keyboard Wake Up button and even work long enough to allow the user to 
re-logon, but then often freeze or panic with the Caps Lock and Scroll Lock 
lights blinking.
If it does continue to a usable desktop, further use of the Sleep key will only 
cause the monitor to go dark briefly, but always keep the fans running, and 
automatically wake up again just seconds later most of the time - also 
resulting in freezes with Caps Lock and Scroll lock blinking in many cases.

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https://bugs.launchpad.net/bugs/989674

Title:
  Ubuntu 12.04 i386 does not reboot back Unity from suspend

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