Comment # 8 on bug 1088287 from Michal Srb

(In reply to Stefan Dirsch from comment #7)
> Hmm. Might have been addressed by this xorg-x11-server change, we made for
> Leap 15/Tumbleweed.
> 
> -------------------------------------------------------------------
> Tue Mar 27 14:42:18 UTC 2018 - msrb@suse.com
> 
> - Update and re-enable n_xserver-optimus-autoconfig-hack.patch.
>   (bnc#1084411)

I think this is not related. This patch was enabled and working in Leap 42.3
and also in Leap 42.2. It was disabled and recently re-enabled in Leap 15 and
Tumbleweed, but that should not matter in this bug since it is reported against
Leap 42.3.

I am not familiar with the suse-prime scripts either. I have read them briefly
now and they seem to be quite fragile, but I can't tell what may have went
wrong. Both the Xorg.0.log and Xorg.0.log.old show situation when nvidia is the
primary GPU and intel is secondary. It seems that intel gets correctly
configured as output source because it sets up the eDP1 output. But shortly
after the X server is cleanly terminated. My guess is that the display manager
fails. You could try if switching to some other display manager helps (KDM,
GDM, SDDM, ...).