https://bugs.freedesktop.org/show_bug.cgi?id=79980
--- Comment #19 from agapito tcxjy@vomoto.com --- (In reply to comment #17)
(In reply to comment #15)
This bug is caused by TAHITI_mc2.bin firmware. The old firmware works good.
Did you test a new kernel with the old firmware or an old kernel without the new firmware patch? It could be some other change if you did the latter.
3.14 or 3.15 + New firmware = Crashes
3.14 or 3.15 + Old firmware = No problems!