Initscript of sys-power/cpufreqd should `use' acpid, otherwise on shutdown it would sometimes complain about failure to call acpi functions. Reproducible: Sometimes Just need to change `use logger lm_sensors' in /etc/init.d/cpufreqd to `use logger lm_sensors acpid', and of course that modification should indeed be made to the file `/usr/portage/sys-power/cpufreqd/files/cpufreqd-init.d'.
I think that this can be done. Direct dependency(e.g. need) can not be set, cause sys-power/acpid is keyworded -ppc, while sys-power/cpufreqd is not.
dropped