Hallo,

0.) Single Processor System with SIS chipset
1.) eCS 1.2 R
2.) kernel: 14.104a_W4 (Warp4 kernel)
3.) ACPI: Version 3.09 (acpi-20080423.zip)
4.) APM: Version 1.24 (acpi-apm-20080423.zip)

After reading the ACPI and APM docs which I found confusing I finally: