(In reply to Alexander Tsoy from comment #15)
> Ah.. "st/mesa,gallium: add a workaround for Unigine Heaven 4.0 and Valley
> 1.0" is also included in mesa-10.3. So both Heaven 4.0 and Valley 1.0 should
> just work. The question is why ARB_sample_shading is causing GPU lockup on
> VERDE. Should I open a separate bug for this issue?

Maybe check that the your /etc/drirc has the workaround and/or if you have a
.drirc in your home dir that it has it also, though I haven't tested if having
a .drirc under $HOME without the workaround overrides one in /etc with it.