I've heard the story from an Apple Discussion forum that they also said it was a software problem. Could be the same complainant, though.
Not sure if I posted here, but I get it every now and again, mostly when I'm i'm on low power, but not necessarily.
Ctrl-shift=eject fixes it instantly.
My MPB is currently at a repair center (third party distributor). Apple told the technicians there that they shall not try to repair (e.g. by exchanging the logic board) as Apple is aware of the problem and working on a solution (which probably will be software/ firmware related).