Comment # 26 on bug 103370 from Timo Aaltonen

this was tested to regress between mesa 12.0.3 and 12.0.5, and bisect points
out

commit d3d33918c79d9e87aedaf6f70ed39f75eed262a0
Author: Michel Dänzer <michel.daenzer@amd.com>
Date:   Wed Aug 17 17:02:04 2016 +0900

    loader/dri3: Overhaul dri3_update_num_back

as the first bad commit