https://bugs.freedesktop.org/show_bug.cgi?id=91880
--- Comment #43 from Lauri Gustafsson luutifa@gmail.com --- (In reply to lainlives from comment #42)
I worked around this by setting performance & high BEFORE Xorg is able to start. I seem to only have this problem if it switches power modes while X is running.
My card still hangs after a little use even when setting performance to power_dmp_state before startx. http://imgur.com/GQf2NJY