(In reply to comment #3)
> It's probably a mesa bug then.  Since those two patches just enable mesa to
> use additional features (htile and DMA).  Probably one of these mesa commits:
> 24b1206ab2dcd506aaac3ef656aebc8bc20cd27a
> 6532eb17baff6e61b427f29e076883f8941ae664
> 325422c49449acdd8df1eb2ca8ed81f7696c38cc
> 
> Does setting the env var R600_HYPERZ=0 or resetting your git tree back to
> cf5632094ba0c19d570ea47025cf6da75ef8457a fix the issue?

I couldn't bisect mesa due to compile issues, but disabling HyperZ does fix the
issue.