https://bugs.freedesktop.org/show_bug.cgi?id=66942
--- Comment #16 from Harald Judt h.judt@gmx.at --- Sorry, I think I have to disappoint you, I don't think it will help with your problem; I got the wrong config without the CAYMAN_smc.bin, and it hang for a minute or so. After adding it, all worked fine (except for the issue with hibernate/resume).