Novell LINUX ENTERPRISE DESKTOP 10 SP2 - DEPLOYMENT GUIDE 08-05-2008 Deployment Manual page 555

putting the processor to sleep (C states). Depending on the operating mode of the
computer, these methods can also be combined.
28.2 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 actions must be triggered before the system is
suspended. To view the battery charge level, you need special program packages and
a suitable kernel.
SUSE Linux Enterprise® kernels have built-in APM support. However, APM is only
activated if ACPI is not 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.
BIOS implementations that are not fully standard-compliant can cause problems with
APM. Some problems can be circumvented with special boot parameters. All parameters
are entered at the boot prompt in the form of apm=parameter with parameter
being one of:
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.
Power Management 539