https://bugs.freedesktop.org/show_bug.cgi?id=64201
--- Comment #17 from Aaron Watry awatry@gmail.com --- I can at least confirm that the lock-ups also happen on a CEDAR (HD 5400) with the 3.9.0 kernel and latest drm/llvm/mesa master. This machine at least doesn't hard lock (GPU resets after 10 seconds...), so I'll attach the results of:
R600_DEBUG=trace_cs,nodma bfgminer -v1