Comment # 5 on bug 96964 from John Bridgman

At the risk of sending things off in the wrong direction, my first thought is
some kind of funky data caching thing when reading GRBM_STATUS using POWER
hardware. 

If bit 31 were always 1 and the other bits were behaving normally then the idea
of being stuck at 100% load would make more sense, but bit 31 stuck at 1 and
all the rest stuck at 0 seems really odd.