[Nouveau] gpu lockup detection and fallback to noaccel

[Marcin Slusarz]

Hi

I have a very rough patchset which adds support for GPU lockup detection and fallback
to (more or less) noaccel to xf86-video-nouveau.

As the patches are only a proof of concept and needs a lot of work, I would like
to know first if this is a desired feature - I don't want to spend a couple of days
on patches which will be ignored or rejected with a reason "we don't need it".

So, what do you think?

Marcin