Comment # 4 on bug 1124544 from Wolfgang Bauer

(In reply to David Seward from comment #3)
> For the other people who seem to be having this issue, I am unsure.

What other people?
If somebody has a different problem, they should report a separate bug anyway.

> Is there an easy way to check if Auto-Login is enabled?

grep AUTOLOGIN /etc/sysconfig/displaymanager

Or YaST->Securtiy and Users->User and Group Management->Expert Options->Login
Settings.

But again, Autologin is totally unrelated to suspend/resume and only affects a
fresh boot.

Note that it is also configurable whether the screen should be locked on
suspend (systemsettings5->Desktop Behavior->Screen Locker), but as you say it
only happens sometimes I suppose you didn't turn that off.