https://bugs.freedesktop.org/show_bug.cgi?id=73911

--- Comment #18 from Bernhardt Mark wrgcpp@gmail.com --- I have the same problem on my laptop Samsung NP355V4C with 7660G and 7670M. I have tried 3.13 kernel on Kubuntu 14.04 x86-64 and Debian Wheezy x86-64 (with default debian kernel config from /boot), and this problem was observed in both distributions.