Comment # 43 on bug 91880 from Lauri Gustafsson

(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