acpi not accepting command

[E GCP]

Hi!

I'm running FC3 (2.6.10-1.766_FC3smp) on a HP ZD7000 laptop (2G RAM). In 
grub.conf I set up acpi=on apm=off and my sleep.sh is as shown below.

Here is my sleep.sh:
#!/bin/sh
# pre-suspend:
oldvt=$(fgconsole)
chvt 1
/sbin/modprobe -r uhci_hcd
/sbin/modprobe -r ehci_hcd
echo mem > /sys/power/state
# on wake-up:
video_post
/sbin/modprobe uhci_hcd
/sbin/modprobe ehci_hcd
chvt $oldvt

The script is run when I close the lid. So, I close the lid and the laptop 
seems to go into sleep, but wakes up right away. I finally tracked down the 
problem to this command:
echo mem > /sys/power/state

For example, if I type in a terminal as root: echo mem > /sys/power/state 
nothing happens. It takes the command in very quicky and doesn't send any 
error, but it also doesn't do anything either. Just like if I have pressed 
the RETURN key with no command before it.

It seems like I'm missing the proper ACPI support in the kernel, but this 
kernel comes straight from Fedora and I have not changed anything in the 
kernel. I have a HT CPU so I'm using the smp that needs ACPI and it 
recognizes that ACPI is there with no errors. Also, the LID triggers the 
sleep.sh script as it should. So, is there somewhere another switch for 
ACPI? What am I missing?

Thanks,
egcp