To make the system shutdown when you press the power button, add the acpid package.
pacman -S acpid
Then add it to the DAEMONS array in rc.conf
DAEMONS = (...... acpid)
Then create a file for the event,
sudo nano /etc/acpi/events/power
With...
# /etc/acpi/events/power
# This is called when the user presses the power button
event=button/power (PWR.||PBTN)
action=/sbin/poweroff
ACPI Shutdown
Now add these two lines to the end of your kernel load in /boot/grub/menu.lst
acpi=on acpi=power-off
What this extra bit will do is force the machine to poweroff completely on shutdown, rather than halting with the power still running.







