https://bugs.freedesktop.org/show_bug.cgi?id=71796
--- Comment #9 from libgradev@gmail.com --- Thanks.
I have tried that patch in a kernel build kindly supplied by fritsch (https://github.com/fritsch/linux/commits/master) but the issue still remains - no improvement.
I also built Mesa and the 2D driver from master late yesterday - still locks.
Please let me know if I can test anything else!