(In reply to comment #11)
> This is with kernel 3.16.2-200.fc20, xorg 1.14.4, mesa-10.1.5,
> xf86-video-nouveau-1.0.10. I wasn't able to find Fedora 20 packages for
> mesa-10.2.x, but I'm guessing this works with 10.2 as well.
> 

I tested with mesa-10.2.5 using a Fedora COPR[1], and it works better! I'm not
getting rendering artifacts while running things other than glxgears.

1. http://copr.fedoraproject.org/coprs/jujuxiii/testing-fc20/