Datasheet

“main” (Installation and Administration) — 2004/6/25 — 13:29 — page 374 — #400

Whenever you uninstall the kernel and use mkinitrd to create an

initrd, the modiﬁed DSDT is integrated and loaded when the system

is booted.

CPU Frequency Does Not Work

Refer to the kernel sources (kernel-source) to see if your proces-

sor is supported. You may need a special kernel module or module op-

tion to activate CPU frequency control. This information is available in

/usr/src/linux/Documentation/cpu-freq/*. If a special module

or module option is needed, conﬁgure it in the ﬁle /etc/sysconfig/

powersave/common by means of the variables CPUFREQD_MODULE and

CPUFREQD_MODULE_OPTS.

Suspend and Standby Do Not Work

There are several kernel-related problems that prevent the use of suspend

and standby on ACPI systems:

Currently, systems with more than 1 GB RAM do not support sus-

pend.

Currently, multiprocessor systems and systems with a P4 processor

(with hyperthreading) do not support suspend.

The error may also be due to a faulty DSDT implementation (BIOS). If this

is the case, install a new DSDT as described under ACPI Activated, Battery

States and Buttons Do Not Work..

On ACPI and APM systems: When the system attempts to unload faulty

modules, the proxy is arrested and the suspend event is not triggered.

The same can happen if you do not unload modules or stop services that

prevent a successful suspend. In both cases, try to identify the modules

causing the problem by manipulating the following settings in /etc/

sysconfig/powersave/common:

POWERSAVE_UNLOAD_MODULES_BEFORE_SUSPEND=""

POWERSAVE_UNLOAD_MODULES_BEFORE_STANDBY=""

POWERSAVE_SUSPEND_RESTART_SERVICES=""

POWERSAVE_STANDBY_RESTART_SERVICES=""

374 17.5. powersave