Hi Gorum, I have a MBA 13" late 2010 running 10.7.2 and the same problem as you.
It seems that a lot of people have the same problem but apple gives no attention to it.
Here is what a tried and didn't work so far:
-Restoring the Permissions;
-Reinstalling OS X Lion;
-Calling Apple Support. It was strange that despite the amount of people that I found with the same problem the guy on the phone said he has never heard about this problem. (I was told to take my computer to a store, but I don't have warranty anymore and I don't have apple in Brazil).
It's hard to consider this a hardware problem because the keys works for the SMC reset. It's more likely to be something wrong with the firmware, but I couldnt restore that.
I know its a blasfemy, but If I can't get this fixed soon, my next computer won't be a mac anymore...(Ubuntu is out there to save us)
Recently, this happens to me too. Suddenly, one day my keyboard and trackpad are not responding at all. Although I try PRAM and SMC reset, nothing is responding. It stuck for 2 days. I need to use the external USB keyboard and mouse to key in the password to boot into the Lion.
I feel extremely depressed, so I decide to take my Macbook air to repair. Before go to repair, I try to backup my system and attach it with the AC adapter.
But strangely, when I charge my Macbook air with AC adapter up to 85% and the machine seems to be quite hot (around 64 Degree Celsius), miracle comes!! Keyboard and trackpad are all back to response.
Could anyone tell me why?
There is apple in Florianopolis and in Blumenau, as far as I know.
I've just bought this brandnew macbook air 13" a month ago, and now trackpad and keyboard
are frozen. Yeah, the apple guy also told me over the phone that he'd never heard this before..hahaha!
How did you solve your problem?