Comment # 23 on bug 82455 from charlie

>>So my patch fixes the virtual address allocation failure?
  I am must change the code. you patch isn't work .
>>That should be R600_DEBUG=nodma.
   Sorry , i am writing error. Actually, i am using R600_DEBUG=nodma
>>What did you try running when this happened?
   i am using X:0& starting X, and I am runing xterm  The GPU is lockup still .
ring index is 0

  when i am runing startxfce4 , the GPU lookup , ring index is 3.