Same issue here, even on the 3.15 rc mainline kernels.  Well, for me the
power lead doesn't make any difference.  Maybe 1 in 5 times, attempting
to suspend the laptop results in it freezing with the keyboard
illuminated.

I haven't been able to replicate the issue if X isn't running (i.e. stop
the lightdm service and issue "echo mem | sudo tee /sys/power/state"),
but if X is running then it happens quite predictably.  Updating to the
latest graphics stack builds from the xorg-edgers PPA didn't help
either.

Did you  have any luck?
This is a bit of a showstopper for me, it's looking likely I'll have to revert 
to OS X.

I did have rEFInd installed at one point, but it got lost in an OS X
update.  I've been booting directly into Ubuntu via EFI.

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https://bugs.launchpad.net/bugs/1299790

Title:
  [Apple Inc. MacBookAir4,1] suspend/resume failure [non-free: wl]

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