Powerplay support/workaround for R7xx

[unggnu]

Hi,

I have tested the new radeon 6.12.1 driver with my Radeon HD 4870 and it 
works great. No more tearing with xv or constant crashes/bugs like with 
the fglrx driver. It is so impressive what you all have achieved in such 
a short period. I thought I have to stay with the fglrx mess for much 
longer.
But there is one big problem which nearly makes using of the free driver 
impossible. 4870 have a very noisy fan if Powerplay isn't supported. I 
have changed the firmware of my card to only use 500 MHZ instead of 750 
for the gpu all the time and a lower voltage but it is still loud while 
much more quiet (like an old computer) than without the change. And of 
course this change isn't good for gaming under Win.
I guess that Powerplay doesn't only scale down to 500 MHZ but also 
disables some shader units or something like that.
Anyway is it possible with the free driver to enter this energy saving 
mode or is there a workaround? With it you nearly can't hear the card if 
you don't use 3d games.
Btw. I don't really understand why there is still a separate free driver 
project when your driver seems to support newer Ati cards better than 
the radeonhd one. You should all work together imho.

Thanks in advance, especially for your great work
unggnu