I recently experimented with kernel 3.18 on opensuse 13.1 but that resulted in
a resume failure on S2RAM, see here for posting:

https://forums.opensuse.org/showthread.php/503846-Failure-to-resume-from-Suspend-to-RAM-Kernel-3-18-1-1-1-g5f2f35e-on-OS-13-1-x64

Oh well I thought time to move onto 13.2 however this now exhibits the same
behaviour as 13.1 + 3.18 kernel (13.1 + 3.11 kernel OK) in that it will not
resume from S2RAM and is hard locked so only a reset will do. This was a clean
install on a brand new SSD drive with home copied so no cruft left over.

I tried both the Nvidia blob from the repos and 346.22 beta the hardway but the
problem persisted. 

With the nouveau driver I experience the same issue as bug 

https://bugzilla.opensuse.org/show_bug.cgi?id=904483

With respect to the nvidia binary blob if I add the following to
/usr/lib/pm-utils/defaults 

HIBERNATE_RESUME_POST_VIDEO="yes"
SLEEP_MODULE="kernel"

then I am reliably able to resume from suspend to RAM - so far only tested
working on OS 13.2 with stock 3.16 kernel and nvidia blob 340.65 from the
nvidia easy way repo.

For further info please see this OS forum thread:

https://forums.opensuse.org/showthread.php/504281-S2RAM-Resume-Failure-on-13-2

Thanks