Also: uninstall nvidia, install nouveau to make your system compatible
with the new linux-rt 3.0 series.
linux-rt 3.0.9-rt25 is *very* stable here.
You can change patch linux-rt too, but I think this is less tested.
The AUR package is outdated, you can use this updated version if you
want to 3.0.9-rt25:
http://hpaste.org/54080