Means more than %90 of the time, my GPU is in High power state.
Indeed with latest Mesa and sitting on Idle state on my GTK3 desktop Power State switching P0 to P2 without apparent reason.
I watch with my GPU with readeontop and don't see any bottleneck on my GPU. There are no use but power state jumps to P2.
I think power switching algorithm need some tune up.
Edit: You can inspect your GPU power states with this Python script
if x >=0 and x <=2:
print "P0:",a/10 ,"P1:", a/10, "P2:", a/10
i noticed too that my 7770 Ghz edition jump to highest values at most minimal load and go back to minimal directly but i can wait for later revision, im happy enough it reclocks