https://bugs.freedesktop.org/show_bug.cgi?id=75992
--- Comment #18 from nucrap@hotmail.com --- Hi, I can confirm this regression on Kernel 3.14 using the the FOSS driver and r7 260x of course.
I experience artifacts, constanst hangs and - in result of the hangs, "colorfully" filled screens rendering the system unusable.
Can I help somehow? I'm not a developer, just to warn you...