https://bugs.freedesktop.org/show_bug.cgi?id=40034
--- Comment #8 from Lauri Kasanen curaga@operamail.com 2011-11-08 05:06:44 PST --- I can't; the same function is used for everything from r600 on - I have no idea whether it would break other hw. As mentioned in the comment above, the bug is not there on a r700 dedicated card on master, which casts further doubt on the patch.
It may simply be an issue in Evergreen loop handling elsewhere, but I really do not understand the hw well enough to say that with any certainty.