Novell LINUX ENTERPRISE DESKTOP 10 SP2 - DEPLOYMENT GUIDE 08-05-2008 Deployment Manual page 557

Subsequently, a number of modules must be loaded. This is done by the start script of
acpid. If any of these modules cause problems, the respective module can be excluded
from loading or unloading in /etc/sysconfig/powersave/common. The system
log (/var/log/messages) contains the messages of the modules, enabling you to
see which components were detected.
/proc/acpi now contains a number of files that provide information about the system
state or can be used to change some of the states. Some features do not work yet because
they are still under development and the support of some functions largely depends on
the implementation of the manufacturer.
All files (except dsdt and fadt) can be read with cat. In some files, settings can be
modified with echo, for example, echo X > file to specify suitable values for
X. One possibility for easy access to those values is the powersave command, which
acts as a front-end for the Powersave daemon. The following describes the most impor-
tant files:
/proc/acpi/info
General information about ACPI.
/proc/acpi/alarm
Here, specify when the system should wake from a sleep state. Currently, this feature
is not fully supported.
/proc/acpi/sleep
Provides information about possible sleep states.
/proc/acpi/event
All events are reported here and processed by the Powersave daemon
(powersaved). If no daemon accesses this file, events, such as a brief click on
the power button or closing the lid, can be read with cat /proc/acpi/event
(terminate with Ctrl + C ).
/proc/acpi/dsdt and /proc/acpi/fadt
These files contain the ACPI tables DSDT (differentiated system description table)
and FADT (fixed ACPI description table). They can be read with acpidmp,
acpidisasm, and dmdecode. These programs and their documentation are lo-
cated in the package pmtools. For example, acpidmp DSDT | acpidisasm.
Power Management 541