(In reply to John Bridgman from comment #5)
> 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.

If it were a data caching issue, how would the GPU crash / soft reset fix it?