PMUD(8) BSD System Manager's Manual PMUD(8)NAMEpmud — constantly checks the Powermanagement unit to see if there is
enough power left to continue.
SYNOPSISpmud [-dhsvkK] [-f facility] [-l seconds] [-m seconds] [-p port]
DESCRIPTION
Pmud is a system daemon, which is usefull only for Apple Macintosh Power‐
books. 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 init(8). It also detects
if the lid is closed, after which the machine is put to sleep. The
options are as follows:
-d Enable debugging; this disables pmud of backgrounding.
-f facility
Use facility for syslogd(8) messages.
-h Print a help message.
-k Do not put machine to sleep when the lid closes, but do power off
the screen.
-K As with -k but put the machine to sleep if running on batteries.
-l seconds
the numbers seconds 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 init(8). The default is
420 seconds.
-m seconds
The number of seconds a “critical low” power level has to endure
in order to start sleeping or initiating a powerfail signal. The
default is 15 seconds.
-n Do not detach. Whit this option the daemon will not become a
background process.
-p port
Specifies the port on which pmud will listen to TCP/IP requests.
This is used by Batmon. Pmud will only listen to requestes on the
localhost address.
-v Print the current RCS version Id of
POWERSIGNALS
When pmud is instructed to issue a powerfail signal to init(8) it will
assume that init(8) has been correctly set up for powerfail and
powerokwait signals. When the powerlevel drops beneath the treshold, pmud
will write the file /etc/powerstatus and send SIGPWR to init(8). If power
is restored (The AC Adapter is connected to mains) the file /etc/power‐
status is written again and onother SIGPWR is send to init(8) 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 sup‐
ported.
CHANGE OF INPUT SOURCE
Pmud 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 - pmud 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 hdparm(8). You can put local commands - like restoring trackpad
settings after a sleep - in /etc/power/pwrctl-local. The arguments to
pwrctl are passed through to pwrctl-local. This script is not distributed
with the pmud-package and will therefore never be overwritten on
upgrades.
POWER POLICY
On startup pmud 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.
BUGS AND CHANGE REQUESTS
Please email your bug reports or change requests to <pmud-bugs@jvc.nl>.
FILES
/dev/adb
/dev/pmu
/sbin/pmud
/etc/power/pwrctl
/etc/power/pwrctl-local
/etc/power/levels
/etc/powerstatus
/etc/rc.d/init.d/pmud
/etc/sysconfig/power
AUTHORS
initial pmud package by Paul Mackerras and initial manual and changes to
pmud-0.[34] by Stephan Leemburg <stephan@jvc.nl>.
SEE ALSOinit(8), hdparm(8), snooze(8) /usr/doc/pmud*/*
LinuxPPC pmud Februari 10, 2000 LinuxPPC pmud
