why my computer can't automatically power off after shutdown

I have updated my kernel from 2.4.18 to 2.4.20, now my redhat can't automatically poweroff after shutdown, what I should do?

This is part of my kernal config file,could u tell me where is wrong?

CONFIG_APM=y
# CONFIG_APM_IGNORE_USER_SUSPEND is not set
# CONFIG_APM_DO_ENABLE is not set
CONFIG_APM_CPU_IDLE=y
# CONFIG_APM_DISPLAY_BLANK is not set
CONFIG_APM_RTC_IS_GMT=y
# CONFIG_APM_ALLOW_INTS is not set
# CONFIG_APM_REAL_MODE_POWER_OFF is not set

when my system is running, I can see the daemon apm

root 495 1 0 17:04 ? 00:00:00 /usr/sbin/apmd -p 10 -w 5 -W -P