When I installed OpenSuSE 12.3 on my VAIO laptop, suspend is not working (not even suspend command). Instead, I have to issue s2ram command in OpenSuSE to suspend my machine. To make it the default sleep module (uswsusp), here are the steps required:

1. Edit /etc/pm/config.d/module and add the following line:

SLEEP_MODULE=uswsusp

2. Edit /etc/pm/config.d/defaults and add the following line:

S2RAM_OPTS="-f"

3. Reboot and it will go to sleep again.

REFERENCES
1. OpenSuSE Documentation
2. Ask Ubuntu Thread