https://bugs.freedesktop.org/show_bug.cgi?id=72685
--- Comment #20 from Michel Dänzer michel@daenzer.net --- (In reply to comment #18)
So if someone succesfully fix that currently in various ways broken shadows setup in r600/radeonsi code, he will fix hyperz artifacts too :).
It's not that simple unfortunately. At least in Sanctuary, the shadows work perfectly now without HyperZ but are still broken with it.