Wie schauts denn mit ACPI aus?
6.13.2 Configuring ACPI
The acpi.ko driver is loaded by default at start up by the loader(8) and should not be compiled into the kernel. The reasoning behind this is that modules are easier to work with, say if switching to another acpi.ko without doing a kernel rebuild. This has the advantage of making testing easier. Another reason is that starting ACPI after a system has been brought up is not too useful, and in some cases can be fatal. In doubt, just disable ACPI all together. This driver should not and can not be unloaded because the system bus uses it for various hardware interactions. ACPI can be disabled with the acpiconf(8) utility. In fact most of the interaction with ACPI can be done via acpiconf(8). Basically this means, if anything about ACPI is in the dmesg(8) output, then most likely it is already running.
Note: ACPI and APM cannot coexist and should be used separately. The last one to load will terminate if the driver notices the other running.
In the simplest form, ACPI can be used to put the system into a sleep mode with acpiconf(8), the -s flag, and a 1-5 option. Most users will only need 1. Option 5 will do a soft-off which is the same action as:
# halt -p
The other options are available. Check out the acpiconf(8) manual page for more information.
