Just want to remind you that there is a Mesa connection somehow. Either it's a
kernel call only later Mesa versions implement or it's a Mesa issue – I'm
stable for *months* now on Linux 3.16/3.17 and this downgraded packages on Arch
Linux with a Radeon HD 7770:
ati-dri-10.1.4-1-x86_64.pkg.tar.xz
clang-3.4.1-2-x86_64.pkg.tar.xz
lib32-llvm-libs-3.4.1-1-x86_64.pkg.tar.xz
lib32-mesa-10.1.4-1-x86_64.pkg.tar.xz
lib32-mesa-libgl-10.1.4-1-x86_64.pkg.tar.xz
llvm-3.4.1-2-x86_64.pkg.tar.xz
llvm-libs-3.4.1-2-x86_64.pkg.tar.xz
mesa-10.1.4-1-x86_64.pkg.tar.xz
mesa-demos-8.1.0-2-x86_64.pkg.tar.xz
mesa-libgl-10.1.4-1-x86_64.pkg.tar.xz