I thought Powernow would not be running at all on default CentOS 4 since AMD says to recompile the kernel with the linux driver package they provide, and the latest drivers don't work with kernels before 2.6.9, anyway. After your three postings I googled around and found I have to load the powernow and cpufreq-ondemand modules. I did so on one of my machines and changed the governor to ondemand. Seems to work so far, no error messages yet. My machines are on AM2 sockets. One problem I have is that I don't get cpuinfo_cur_freq, only scaling_cur_freq. I also don't get any temperatur reading via /proc/acpi/thermal_zone, but I assume that's because of the chipset? (nforce 430). Kai -- Kai Schätzl, Berlin, Germany Get your web at Conactive Internet Services: http://www.conactive.com