Comment # 6 on bug 1024652 from Filip Ko��odziejczyk

(In reply to Fabian Vogt from comment #5)
> (In reply to Filip Ko��odziejczyk from comment #3)
> > Not sure if it is the same bug but it seems to me that it is.
> > 
> > I noticed it while looking for a solution with flatpak apps.
> > Basically when I start my laptop and start a flatpak immediately before WiFi
> > connection is established it starts without a problem but when WiFi is
> > connected I get "Cannot open display" error.
> > 
> > Turned out that "echo $XAUTHLOCALHOSTNAME" and "hostname" commands outputs
> > are different. Resetting a hostname in Yasts Network Settings solves the
> > problem but only until reboot.
> 
> Same as https://bugzilla.suse.com/show_bug.cgi?id=966671?

Yep, it seems like it. I would say it is a duplicate of that bug.

Anyway, hostnamectl --static set-hostname NORM07 fixes the problem (not sure
yet if it fixes the problem permanently)