[Nouveau] yuy2 not working in ubuntu 13.10

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For many years im using the ubuntu with nouveau and the yuy2 scalemode in
mame. I think the last one was 11.10 or 12.04, not sure.
Now in the ubuntu 13.10 the yuy2 scalemode dont work in mame, but works
fine with the intel driver.

Tested with the kernels 3.11 and 3.12 from the ubuntu repository.

I think there's a regression in the nouveau used in ubuntu 13.10 with yuy2.
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