Comment # 15 on bug 1013200 from Patrick Schaaf

(In reply to Stefan Dirsch from comment #12)
> Ok. Apparently Xserver couldn't be started. Please try this with original
> update kernel 4.4 for Leap 42.2 in place and plymouth uninstalled/disabled.
> 
>   X -retro -verbose 7 -logverbose 7 : 99 & sleep 3; DISPLAY=:99 xterm &
> and attach  
> /var/log/Xorg.99.log

I did that, after "systemctl set-default multi-user" and reboot, so no plymouth
or display manager autostart.

It worked - X started, I got the xterm, and could terminate. Do you still want
to see the Xorg.99.log ?