I tried the following 3 kernel variants (all 4.1.13-5): vanilla, debug and default. All show exactly the same behavior. I fear the extended excerpt (attached above) of 1/2 a minute of the debug journal is not really enlightening, as there seems to be just this one error message when greeter screen appears for the second time. Is there a repo with newer revisions of the kernel for openSUSE? As this seems to be a reasonably easy exercise, I could try some newer revisions oder release candidates.