Table of Contents
Advertisement
(no-)power-off
Power system off after shutdown.
bounce-interval=n
Time in hundredths of a second after a suspend event during which additional
suspend events are ignored.
idle-threshold=n
System inactivity percentage from which the BIOS function idle is executed
(0=always, 100=never).
idle-period=n
Time in hundredths of a second after which the system activity is measured.
The APM daemon (apmd) is no longer used. Its functionality is now handled by the
new powersaved, which also supports ACPI and provides many other features.
28.3 ACPI
ACPI (advanced configuration and power interface) was designed to enable the operating
system to set up and control the individual hardware components. ACPI supersedes
both PnP and APM. It delivers information about the battery, AC adapter, temperature,
fan, and system events, like "close lid" or "battery low."
The BIOS provides tables containing information about the individual components and
hardware access methods. The operating system uses this information for tasks like
assigning interrupts or activating and deactivating components. Because the operating
system executes commands stored in the BIOS, the functionality depends on the BIOS
implementation. The tables ACPI can detect and load are reported in /var/log/boot
.msg. See
troubleshooting ACPI problems.
28.3.1 ACPI in Action
If the kernel detects an ACPI BIOS when the system is booted, ACPI is activated auto-
matically. The boot parameter acpi=force may be necessary for some older machines.
The computer must support ACPI 2.0 or later. Check the kernel boot messages in /var/
log/boot.msg to see if ACPI was activated.
540
Deployment Guide
Section 28.3.4, "Troubleshooting"
(page 546) for more information about
Advertisement
Table of Contents
Troubleshooting
