can't hibernate on Thinkpad T21e

Hi, I installed Suse 7.2 on my Thinkpad T21e and like it with everyday more. Everything seems to work much better than in RH or Mandrake. However I have one problem that I need to solve: My thinkpad will not hibernate. It will very nicely suspend, but when I hit Fn + F12 (hibernation) it will just give me low sound and do absolutely nothing. Just so you know I have dual boot machine Win2K + Suse 7.2. (In win2K my T21 has no problem with hibernation). So why is he so stubborn while working with Suse?? Thanks for all the help or suggestions. Wojtek