Does anyone know if was a fault with the ADIRU / ADIRS ?
and was it made by Northrop Grumman ?
Did the crew and passengers lose consciousness ?
If you ask me, it sounds like someone is trying to speculate on a particular part made by Northrop Grumman. As of right now, nobody knows any of that information and it won't be known for some time. As for the crew and passengers, we don't know that either. While there was a report that an automated message sent from the aircraft said there might be a possible pressurization problem, we do not know to what extent, and whether or not this was actually the case. In the event of a pressurization problem, the overhead air masks would drop out to passengers and the crew would don their masks. It's not likely they lost consciousness if any sort of pressurization problem occurred, whether it was minor or explosive decompression. Usually, the accident investigation does not focus on what happened to the crew/passengers, so we'll likely never know.
Right now, it looks like the big focus is locating this aircraft. There is a large area they are looking at searching and they really need to narrow that down.
As for the Air Transat flight someone mentioned, that was a completely different scenario. The crew didn't have to deal with any sort of weather issues. Also, their problem was caused by a mechanic using the wrong part on an engine's fuel line, resulting in the aircraft dumping fuel through the engine and the crew's lack of training on the new glass cockpit. In this situation with the Air France flight, it sounds like this aircraft was disabled in some fashion, whether lightning actually did disable the aircraft or of the aircraft hit severe or even extreme turbulence. If they were in severe/extreme turbulence long enough, the aircraft may have become stressed and it is possible that one of it's surfaces failed. Given the fact that the aircraft was flying through thunderstorms, I would say it's going to be more than one issue that brought this aircraft down, as tends to be the case with these large accidents. With no mayday call, it's likely this aircraft went down quick. Of course, if the crew had to put full attention towards flying the aircraft, the may day call would only come when they had a chance. The big rule is "aviate, navigate, communicate" so communication would have come later as flying the aircraft is, of course, top priority.