https://bugs.freedesktop.org/show_bug.cgi?id=62959
--- Comment #40 from udo udovdh@xs4all.nl --- in /etc/environment I have R600_DEBUG=nodma ever since discovering that setting, i.e.: also now the R6))_DEBUG is set to nodma.
I did not apply any of your patches over the 3.9.0-rc7 kernel.