Last game a character dropped unconscious with exactly -1 HP. The party's paladin used on his turn 'Beacon of Nobility' to give the unconscious character 5 temporary hit points.

The Rules Compendium says on temporary hit points that if you have 0 hit points and gain temporary hit points you still have 0 hit points.

So the character had -1 HP and +5 temporary afterwards.

Can the character regain consciousness with temporary hit points?

I think not, but i am not 100% sure; the RC it not super clear to me on this. I always taught of unconsciousness as being lower that 1 HP, but in the above scenario it could also mean that even so you are negative you could still be conscious.. ?