https://bugs.freedesktop.org/show_bug.cgi?id=81644
--- Comment #87 from Michel Dänzer michel@daenzer.net --- (In reply to comment #86)
I think in the meantime Grigori has seen GPU hangs even with that patch though, with 2D tiling.
However, can you avoid the problem if you start Chromium with the environment variable R600_DEBUG=nodma?