Suspend issue on Intel DG965RY system

I'm having a minor issue with suspend-to-ram on an Intel DG965RY system. I'm using a 2.6.25 kernel. The system does suspend and resume correctly, but sometimes (roughly 40% of the time I'd estimate) it suspends again just after the resume succeeds.

The obvious workaround I've been using is to keep pressing the power button as many times as needed for the machine to stay on...

I did notice that when the system suspends multiple times, the value in /sys/firmware/acpi/interrupts/ff_pwr_btn increments by that many times.

I do run acpid, and my powerbtn.sh script includes the following:
/etc/init.d/apcupsd stop
/etc/init.d/ntp stop
sync
echo mem > /sys/power/state
/etc/init.d/ntp start
sleep 5
/etc/init.d/apcupsd start
/etc/init.d/anacron start

I see there was a thread "Machine shutdown after resume from S3" back in february, this sounds somewhat similar to my problem. I have not tried removing the button module around a suspend - I actually don't have it built as a module right now, is there any other way to temporarily deactivate the button module ?

Thanks for any advice,

Michel Lespinasse