I'm on an amd64 system. I've had to insert sys-apps/suspend2-userui x86 in /etc/portage/package.keywords. I'm now running sys-apps/suspend2-userui-0.6.3 and it works perfectly fine. Please keyword it accordingly. Only note is to switch to text mode (Ctrl-Alt-F1) before running it in test mode, it doesn't work well otherwise. I.e. what hibernate does automatically.
0.6.3-r1 marked ~amd64 thanks