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PMUD(8) System Manager's Manual PMUD(8)
checks the Powermanagement unit to see if there is enough power left to continue. is a system daemon, which is usefull only for Apple Macintosh Powerbooks. It constantly checks the Powermanagement unit to see if there is enough power left to continue. If power runs short, it will put the machine to sleep or issue a powerfail signal to It also detects if the lid is closed, after which the machine is put to sleep. The options are as follows: Do not beep when going to sleep or waking up. Enable debugging; this disables pmud of backgrounding. Use for messages. Print a help message. Do not put machine to sleep when the lid closes, but do power off the screen. As with -k but put the machine to sleep if running on batteries. the numbers of power left which is considered to be a critical low level. When this level is reached and if this state remains for a determined period of time, the system is put to sleep or a powerfail signal is issued to The default is 420 seconds. The number of power level has to endure in order to start sleeping or initiating a powerfail signal. The default is 15 seconds. Do not detach. Whit this option the daemon will not become a background process. Do not save/restore backlight settings when sleeping (use for offb displays). Specifies the on which will listen to requests. This is used by will only listen to requestes on the address. Print the current RCS version Id of Use as critical low condition to drain a battery beyond a false time left treshold sometimes observed with aging batteries. Needs -l 0 to prevent early sleep or shutdown due to low time left. When is instructed to issue a powerfail signal to it will assume that has been correctly set up for powerfail and powerokwait signals. When the powerlevel drops beneath the treshold, will write the file /etc/powerstatus and send to If power is restored (The AC Adapter is connected to mains) the file /etc/powerstatus is written again and onother is send to to indicate power has been restored. Before using this option, you should test your init-setup manually to verify if power-signal handling is correctly supported. will detect if the machine is running on battery or on the AC Adapter. It will also notice when this changes. When machine is running on battery and is switched to the AC Adapter - or vice versa - will run the script /etc/power/pwrctl. This script will handle additional actions to be performed in order to gain maximum performance or minimal power consumption. The default script will only set hd spindown times, using You can put local commands - like restoring trackpad settings after a sleep - in /etc/power/pwrctl-local. The arguments to are passed through to This script is not distributed with the pmud-package and will therefore never be overwritten on upgrades.
On startup will read the file /etc/power/levels. It initialises it's power policy with the values in this file. There are two numeric values in this file. The first value is the battery policy, the second value is the AC policy. Valid values are 1 (minimum power consumption), 2 (medium power consumption) and 3 (maximum power consumption). Obviously, minimum power consumption degrades the systems performance and vice versa.
Please email your bug reports or change requests to <>.
initial pmud package by Paul Mackerras and initial manual and changes to pmud-0.[34] by Stephan Leemburg <>.
January 23, 2015 Debian Sid