Comment # 49 on bug 917411 from Takashi Iwai

(In reply to macias - from comment #47)
> Yast did everything automatically -- I have in total:
> showopts apm=off noresume edd=off powersaved=off nohz=off highres=off
> processor.max_cstate=1 nomodeset x11failsafe crashkernel=512M-:256M

This is for the failsafe mode.  Does the normal boot options also have
crashkernel option, too?  Just to be sure.

If crashkernrel is set but not recorded, and you have no other way to access
the machine at crash, and there is no log recorded mentioning the crash...  No
way to analyze more, unfortunately.

If so, I'd suggest to do hardware tests and a clean installation from the
scratch.