Not able to wake up from sleep mode

I have SUSE 11.1. I’m not able to wake up out of sleep mode. Can someone point me in the right direction? It’s probably something very, very simple.

acpid is set at runlevels 2,3,4,5

In the Power Management applet, I have the display to sleep when inactive for 50 minutes, the computer itself to sleep at 54 minutes.

Are you using kde3 kde4 or gnome?

I’m using Gnome.

Just to clarify:
Are we talking suspend to ram
or suspend to disk

I’m not a gnome user, but maybe one will drop in too.

Suspend to RAM

Have you checked here: Suspend to RAM - openSUSE