Comment # 2 on bug 1010663 from Alexei Sorokin

I got openSUSE Leap 42.2 in QEMU, where suspend works (unlike VirtualBox) to
reproduce this.
So I installed it, fetched Xfce and light-locker (without any system updates):
"xfce4-session-logout -s" did put the system in suspend, after resuming
light-locker kicked in, everything's dandy.
Then I installed Leap 42.2 updates, rebooted and tried again: same result.
Everything works like expected.

What could be happening for you is an X11 (or LightDM?) crash after the
suspend.
Does this sound plausable?