Some machines (typically laptops and Energy Star or ``green'' systems) provide facilities for controlling power consumption. SCO OpenServer systems can use APM if it supports a 32-bit Protected Mode interface, and it resides in the computer's BIOS (that is, APM is not loaded as a separate driver).
On laptops, the power management facilities usually provide a report on the battery charge level, permitting you to shut down the machine before the batteries are completely discharged. Some systems may be able to turn off hard disks or monitors after a period of inactivity, or by explicit command.
If your system has the required APM hardware, and
this was recognized and enabled by
at boot time, see
``Advanced Power Management bootstrings''.
The Power Management daemon,
runs to handle system events notified by the
BIOS-APM firmware, such as low power. Possible
events are defined in the file
/etc/pwr/sys/events, the format is defined on the
manual page. An action is defined for each event that
allows the system to respond appropriately. Possible
actions are defined in the file
/etc/pwr/sys/actions, the format for which is
defined on the
manual page. You can find the scripts invoked by the
action file in the directory
/etc/pwr/lib. An example is battery
which shuts the system down if the power is low. Edit the
actions file and scripts to tailor the response
of your system to the various power events. However,
events are pre-defined in the BIOS; you cannot
configure the thresholds at which they occur yourself.