 I can confirm this with Radeon 8400, hyperz leaves those artifatcs with hyperz
enabled... but actually i dont think hyperz is at most quilty here, because
first of all rendering on that scene must be proper and actually it is not even
with hyperz disabled as i mention in bug 77785 :). I somehow tend to think
hyperz just likes proper rendering, otherwise when it is not there will be bugs
like this ;).