https://bugs.freedesktop.org/show_bug.cgi?id=66963
--- Comment #202 from Nicola nicolamori@aol.com --- With linux 3.14-RC8 things are much better for my RV620 (Mobility HD3470). I booted about ten times without any hang, only once I was dumped to tty with X server refusing to start (unfortunately I lost the log, thanks to the foolish log retain policy of X...). But no hang with black screens as before, yet.