cpufreqd(8) [debian man page]
CPUFREQD(8) CPUFREQD(8) NAME
cpufreqd - intelligently monitor and manipulate CPU frequency SYNOPSIS
cpufreqd [-Dmhv] [-f filename] [-V verbosity] DESCRIPTION
cpufreqd is used to monitor the status of the system and adjust the frequency of the CPU according to the user configuration. The behav- iour of the daemon is fully configurable. Logs are reported through syslogd. PARAMETERS
-D, --no-daemon stay in foreground (used to debug). -m, --manual start in manual mode. -f filename, --file=filename Specify the configuration file to read. The default is /etc/cpufreqd.conf. -h, --help Display command line help. -v, --version Display the version number of the daemon. -V, --verbosity verbosity level from 0 (less verbose) to 7 (most verbose). Default verbosity is 4 SIGNALS
SIGHUP 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) SIGINT, SIGTERM cpufreqd will terminate. EXAMPLES
/usr/sbin/cpufreqd -D NOTES
Some ACPI implementations are very cpu-consuming when reading the info file of system batteries. Cpufreqd implements a simple workaround that avoids reading that file except on initialization or reinitializa- tion. This has the effect of needing to send an HUP signal if inserting a new battery, otherwise battery measurement won't be cor- rect. FILES
/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 SEE ALSO
cpufreqd.conf(5),syslogd(8),cpufreqd-set(1),cpufreqd-get(1) BUGS
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. AUTHOR
George Staikos <staikos@0wned.org> Mattia Dongili <malattia@linux.it> Rene Rebe <rene@rocklinux.org> 05 May 2005 CPUFREQD(8)
Check Out this Related Man Page
ACPITOOL(1) User Commands ACPITOOL(1) NAME
acpitool - a Linux ACPI client, allowing you to query or set ACPI values SYNOPSIS
acpitool [ -aAbBcefFhjlmnosStTvVwWz ] DESCRIPTION
acpitool is a Linux ACPI client. It simply reads /proc/acpi or /sys/class entries and presents the output in a meaningfull, human-readable format. It provides a.o. information on battery status, AC adapter presence, thermal reading, etc. This command is most useful on laptops with an ACPI compliant BIOS and a Linux kernel, preferably from the 2.6 series, with ACPI enabled. Acpitool also allows the machine to be put into standby, if your laptop supports it. If your laptop is a Toshiba , it allows you to set the LCD brighness level and toggle the fan on/off. If you have an Asus laptop, it can also set the LCD brightness level, switch the LCD panel on or off, and control the mail led and wireless led. If you have an IBM Thinkpad laptop, it can once again set the LCD brightness level, and also eject the ultrabay device. OPTIONS
-a, --ac_adapter Show AC adapter presence -A Show supported Asus ACPI extensions (LCD brightness level, video out routing DSDT/acpi4asus info) -b Show battery status information, available batteries only. -B, --battery Show detailed battery status information, for all battery entries found. -c, --cpu Show CPU information (type, speed, PM capabilities, throttling states, c-state usage, frequency scaling). -e Show just about everything : more info on the batteries, ACPI version, kernel version, CPU, . . . -f, --fan Show fan status (shows fan info specific to Toshiba or IBM Thinkpad, if applicable). -F x Force the fan on (x=1) or switch back to auto mode (x=0). Works only on Toshiba laptops. The fan is switched off ONLY if it was forced on first, not if it was switched on automatically. Requires write access to /proc/acpi/toshiba/fan -h, --help Show help text. -j Eject Thinkpad ultrabay device. Requires write acces to /proc/acpi/ibm/bay -l x Set LCD brightness level to x, where x is in the range 0..7. Works only on Toshiba and IBM Thinkpad laptops. Requires write access to /proc/acpi/tochiba/lcd or /proc/acpi/ibm/brightness Illegal values for x will result in the value being set to either 0 or 7. -m x Switch the mail led on (x=1) or off (x=0). Works only on Asus laptops. Requires write access to /proc/acpi/asus/mled -n x Switch the wireless led on (x=1) or off (x=0). Works only on Asus laptops. Requires write access to /proc/acpi/asus/wled -o x Switch the LCD panel on (x=1) or off (x=0). Works only on Asus laptops. Requires write access to /proc/acpi/asus/lcd -s, --suspend to memory Put the machine into sleep state S3, if possible. Requires write access to /proc/acpi/sleep (kernel 2.4.x) or /sys/power/state (kernel 2.6.x) -S, --suspend to disk ? Put the machine into sleep state S4, if possible. Requires write access to /proc/acpi/sleep (kernel 2.4.x) or /sys/power/state (kernel 2.6.x) -t, --thermal Show thermal zone(s) information, including trip_points. -T, --Toshiba Show supported Toshiba ACPI extensions, currently being LCD brightness level, video out routing (what display is the video chip sending to) and fan status (on/off, forced or not). -v Show more verbose output when something is not found. Makes sense only when used together with other options. -V, --version Show acpitool version number and release date, then exit. -w Show the wakeup capable devices. (Available since ACPI 20040715, check your version). -W x Enable/disable wakeup capable device x. Run 'acpitool -w' to see valid numbers for x. Requires write access to /proc/acpi/wakeup -z x Set Asus LCD brightness level to x, where x is 0..15. Works only on Asus laptops. Requires write access to /proc/acpi/asus/brn REMARKS
This program absolutely requires a Linux kernel with ACPI support enabled. This program will not work without it. IBM Thinkpad support is part of the Linux kernel since kernel 2.6.10. Don't blame me if acpitool can't suspend your laptop : there are quite some problematic laptops out there. Check the acpi-bugzilla list if you don't believe me ;) Note that some options, like -F, -l , -j, -s, -W and -z, require write access to some of the /proc/acpi entries. This requires acpitool either to be run as root or either administrative measures must be taken, most likely by root, to allow ordinary users to write to these files. Creating a group for ACPI users and setting permissions accordingly comes to mind. Also note that older laptops (< 2000) often simply don't have ACPI support, they usually support APM only. BUGS
Let me know if you think you found one. FILES
/proc/acpi/... /proc/acpi/toshiba /proc/acpi/asus /proc/acpi/ibm /sys/power/state HOMEPAGE
http://freeunix.dyndns.org:8000/site2/acpitool.shtml AUTHOR
This program is written and maintained by David Leemans (davidleemans |at| scarlet |dot| be) and may be freely distributed under the terms of the GNU General Public License. There is ABSOLUTELY NO WARRANTY for this program. AcpiTool 0.5 24 Jul 2008 ACPITOOL(1)