Created attachment 178181 [details] radeon log Screen went blank randomly. Log attached. Let me know if any more information woud be useful.
Is the lockup readily reproducible? If so what what actively or application triggers it? Note this is probably a mesa driver bug rather than a kernel driver bug.
No not readily producible so it would be hard to bisect. I never noticed the lockups on 4.0 series, so thought it might be kernel related. This specific crash happened while interacting with eclipse in gnome 3.16.x