1. cpufreq-info not working
a. make sure "CONFIG_CPU_FREQ" is set to Y (or corresponding module is loaded if compile as module (M))
b. Make sure corresponding FREQ_GOV is selected (such as ONDEMAN, or USERSPACE) and loaded.
2. KDE's hardware temperature plasmoid not woring
Make sure that ksysguard is build with USE="lm_sensor".