Comment # 8 on bug 84627 from Michel Dänzer

(In reply to smoki from comment #7)
> No, that does not help for this corruption.

Note that I mean disabling *all* uses of RADEON_FLAG_GTT_WC. With those
disabled, the behaviour should be basically the same as before the commit you
bisected to. If that really doesn't work anymore, can you bisect which other
commit in the meantime broke things without RADEON_FLAG_GTT_WC?