DOKK / manpages / debian 12 / cpufreqd / cpufreqd.8.en
CPUFREQD(8) CPUFREQD(8)

cpufreqd - intelligently monitor and manipulate CPU frequency

cpufreqd [-Dmhv] [-f filename] [-V verbosity]

cpufreqd is used to monitor the status of the system and adjust the frequency of the CPU according to the user configuration. The behaviour of the daemon is fully configurable. Logs are reported through syslogd.

stay in foreground (used to debug).
start in manual mode.
Specify the configuration file to read. The default is /etc/cpufreqd.conf.
Display command line help.
Display the version number of the daemon.
verbosity level from 0 (less verbose) to 7 (most verbose). Default verbosity is 4

This lets cpufreqd perform a re-initialization. The configuration file (default is /etc/cpufreqd.conf) will be re-read and probes re-done. (Not yet implemented in cpufreqd-2.0)
cpufreqd will terminate.

/usr/sbin/cpufreqd -D

system batteries. Cpufreqd implements a simple workaround that avoids reading that file except on initialization or reinitialization. This has the effect of needing to send an HUP signal if inserting a new battery, otherwise battery measurement won't be correct.

/sys/devices/system/cpu/cpu*/cpufreq
kernel cpu frequency interface
/proc/cpufreq
old deprecated kernel cpu frequency interface (please avoid it)
/proc/acpi
kernel power management interface (ACPI)
/proc/apm
kernel power management interface (APM)
/proc/pmu
kernel power management interface (PMU). (Not yet implemented in cpufreqd-2.0)

/etc/cpufreqd.conf
cpufreqd configuration file

cpufreqd.conf(5),syslogd(8),cpufreqd-set(1),cpufreqd-get(1)

Multiple CPUs are not considered separately thus the same policy is set in every available CPU. Battery can only be specified in percent, not in minutes remaining.

05 May 2005