well.. your right about some of the ignition information.. as for Approach idle.. the ignition will only come on when you have selected flap to position 3 or 4.. on GE and all new 330 aircraft ( as this one was only 2 weeks since delivery ) wing anti-ice does NOT give auto ignition system any more.. althought the ignition can be selected manually..
so far it is assumed that there might have been a failure in the ignition system in general, but that does not explain the quick re-light ( 1 minute for the first engine)
airbus sent a team to investigate.