Basic hardware configuration

Configuring Power Management

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.

NOTE: APM is not configured in the kernel by default. You must run the mkdev pm command or use the Hardware/Kernel Manager to install the APM driver and support utilities.

If your system has the required APM hardware, and this was recognized and enabled by boot(HW) at boot time, see ``Advanced Power Management bootstrings''. The Power Management daemon, pwrd(ADM), 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 pwrevents(F) 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 pwraction(F) 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.

Next topic: Configuring APM using pwrsh
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© 2003 Caldera International, Inc. All rights reserved.
SCO OpenServer Release 5.0.7 -- 11 February 2003