https://bugs.freedesktop.org/show_bug.cgi?id=87278
--- Comment #12 from Alexandre Demers alexandre.f.demers@gmail.com --- Sorry, it has been a couple of weeks, but I confirm I have the same problem with my R9 270X. I'm using latest mesa, drm, ddx from git repositories on a 3.19-rc1 kernel.
I'll be attaching my log. I'll also test the patch.