(In reply to smoki from comment #33)
>  glsl-fs-min is one of the random failing tests actually, it sometimes pass
> sometimes fail with or without subreg liveness, so that is not problem here
> i think.

I can't reproduce random failures with glsl-fs-min nor any piglit regressions
with sub-register liveness enabled, but sub-register liveness doesn't seem to
result in any code difference for glsl-fs-min anyway.

Can you find another test which consistently passes without sub-register
liveness and fails with it *and* shows a difference between them in the
R600_DEBUG=vs,ps stderr output, and attach the latter for both cases?