https://bugs.freedesktop.org/show_bug.cgi?id=58667
--- Comment #47 from udo udovdh@xs4all.nl --- Over here, with 3.12.6 and these $ cat /etc/environment LIBGL_DRIVERS_PATH=/opt/xorg/lib/dri/ RADEON_VA=0 R600_DEBUG=nodma
all appears stable.
(git llvm, libclc, mesa, etc)