https://bugs.freedesktop.org/show_bug.cgi?id=79980
--- Comment #165 from Marti Raudsepp marti@juffo.org --- After upgrading to kernel 3.17.1, these GPU hangs/crashes still occur, but now it doesn't hang the whole machine any more. Sometimes it recovers from the GPU hang completely, sometimes it just drops me into a text console. Thanks, that's an improvement.
I am using Radeon R9 270 on Arch Linux.