Datasheet

“main” (Installation and Administration) — 2004/6/25 — 13:29 — page 360 — #386
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17.2 APM
Some of the power saving functions are performed by the APM BIOS itself.
On many laptops, standby and suspend states can be activated with key
combinations or by closing the lid, without any special operating system
function. However, to activate these modes with a command, certain ac-
tions must be triggered before the system is suspended. To view the battery
charge level, you need a suitable kernel and the respective packages.
By default, APM support is integrated in the kernels shipped with SUSE
LINUX. However, APM is only activated if no ACPI is implemented in the
BIOS and an APM BIOS is detected. To activate APM support, ACPI must
be disabled with acpi=off at the boot prompt. Enter cat /proc/apm to
check if APM is active. An output consisting of various numbers indicates
that everything is OK. You should now be able to shut down the computer
with the command shutdown -h.
Strange things may happen if the BIOS implementation does not fully com-
ply with the standard. Some problems can be circumvented with special
boot parameters (formerly kernel configuration options). All parameters
are entered at the boot prompt in the form apm=<parameter>:
on or off Enable or disable APM support.
(no-)allow-ints Allow interrupts during the execution of BIOS functions.
(no-)broken-psr The “GetPowerStatus” function of the BIOS does not
work properly.
(no-)realmode-power-off Reset processor to real mode prior to shutdown.
(no-)debug Log APM events in system log.
(no-)power-off Power system off after shutdown.
bounce-interval=hni Time in hundredths of a second after a suspend
event during which additional suspend events are ignored.
idle-threshold=hni System inactivity percentage from which the BIOS
function idle is executed (0=always, 100=never).
idle-period=hni Time in hundredths of a second after which the system
activity is measured.
360 17.2. APM