Xen users - Apr 2010 - AMD Hardware with working powermanagement on xen 4

Hi,
i am looking for new hardware for my home-server. It is important that 
powermanagement with speedstepping is working with xen 4. Right now i 
have a AMD X2 4850e. With Xen 3.4 and cpufreq=dom0-kernel i am able to 
decrease speed of the cpu from 2,5 GHz to 1 GHz dynamically. 
Unfortunately i have some driver problems with the old kernel version. 
So I tried Xen 4 with pv ops kernel and xen 3.4.3 with pv ops kernel but 
i wasnt able to get speedstepping running. I am getting this "Firmware 
bug, Pss objects missing" thing with every combination. Cpufreq=xen is 
not working because my cpu is not a K10 cpu. So is it possible the have 
al these options to save energy with a Athlon II and a AM3 board with a 
AMD 890GX chipset? Any other ideas?

Thanks,
Ben



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