Comment # 8 on bug 913885 from Mark Scott

I note that you have a WDC WD30EFRX (3TB) which does not support APM IIRC. I'm
having an issue with WD 2TB caviar Blacks which also do not support APM which
initially I thought was an Nvida driver issue. Please can you try the system
without the WD and see if it resumes from S2RAM.

Please see my issue here

https://bugzilla.opensuse.org/show_bug.cgi?id=913105