Comment # 3 on bug 88522 from Marek Zdunek

same here on HD6850, instant gpu lockup when run ./Effects

I tested:
./Effects -> gpu lockup
R600_DEBUG=nosb ./Effects -> gpu lockup
R600_DEBUG=nocpdma ./Effects -> gpu lockup
R600_DEBUG=nohyperz ./Effects -> gpu lockup

kernel.x86_64 3.18.3-201.fc21
mesa-libGL.x86_64 10.4.3-1.20150124.fc21