I have almost forgotten about it. Sanctuary/heaven at latest git (mesa git-6caf34b, llvm svn-199712) all these artifacts are gone. I don't know who/where/when/how but i thint it's not real fix. It looks like hyperz is off by default. When i run sanctuary/heaven with R600_DEBUG=whatever_you_want_except_nohyperz artifacts goes back and performance goes high. I'll try not-involved apps like xonotic or lightsmark or unigine-valley later.