Right, while I don't mind running upstream kernels, I'm not sure this will happen again. It was completely random, I've rebooted many times with that kernel, and I have no way to reproduce it. So what I'll do is actually to keep running the Ubuntu kernel and see if I can get it to happen again. If it does I'll try with the upstream kernel a bit. And I've put the bugreport here so hopefully other people can find it if it happens to them.
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