https://bugs.freedesktop.org/show_bug.cgi?id=80419
--- Comment #132 from Edwin Smith (Feral Interactive) esmith@feralinteractive.com --- (In reply to Davin McCall from comment #131)
I think you missed the significance of my second paragraph above - I have established that the hang is _not_ caused by the mis-use of the glDrawRangeElementsBaseVertex() function. So comparing how the radeonsi and Intel/r600 drivers handle this function is not likely to help in resolving this issue.
OK, I'll leave this one with you but if you need anything else from Feral let us know.