https://bugs.freedesktop.org/show_bug.cgi?id=43000
--- Comment #2 from almos aaalmosss@gmail.com 2011-11-16 11:52:30 PST --- The hw is barts pro (hd6850). The only part changed is mesa: 7.11 is installed (debian unstable), and I compiled one from git. In the latter case I start programs as LD_LIBRARY_PATH=/home/almos/SRC/mesa/lib/ LIBGL_DRIVERS_PATH=/home/almos/SRC/mesa/lib/gallium "$@"
I'll try to bisect later.