Hello, Philip. Thanks for the comment. I tried acpi=off , and just resulted in appearing the message "ACPI disabled". Also "acpi=power-off" didn't work. So "power off" still not working for enterprise kernel. But I found an alternative way. Building the smallest kernel based on 2.4.27 and initrd.img based on busybox, and set GRUB to load them by default. And when I want to power off the PC, execute /sbin/reboot instead of /sbin/poweroff . This results the PC reboot and "power off" immediately. Thank you.
