I had the same problem. I had a hard time to figure out that for cpufreq you also have to install (at least a subset of?) the modules freq_table proc_intf I used modconf where I found these modules listet under "kernel/drivers/cpufreq" tagged as "not installed". I am a newby using Debian Sarge on a Fujitsu Siemens Amilo D, with a Pentium III (Coppermine).