Comment # 4 on bug 1081469 from Heinz Kohl

I've checked the situation with my old PC, an AMD Athlon Monoprocessor under
Tumbleweed (always kernel 4.14.3-1-default) and Lubuntu.
Tumbleweed, after "Benutzer wechseln" without changing owner: Plasma
functionality somewhat restricted - "Benutzer wechseln" and logout impossible.
All other desktop functionality is o.k.
Therefore shutdown is possible by starting and using a command shell.
No change of this behavior after updating Tumbleweed.

New PC, AMD Ryzen 7, tumbleweed, before and after upgrading to newest updates
including 4.15.4-1.g7169cf1-default:
after "Benutzer wechseln" without changing owner: no plasma functionality
beside mouse button operation.

That's maybe the same base error, but the follow up problems are much greater.

A simple change for the login procedure - e.g. an error message! - could
correct the situation.
 ------------
To allow more than one indepently running dialog- and batch logins for one user
was standard in ancient operating systems like TNS440 (1971-1982), but seems to
be nearly impossible for Unix-like systems. For a proper working, it would set
up the need to change the background memory management strategy, changing the
use of temporary and non temporary memory.

OpenSuSE installations: default is same password for root and first user.
As a work around it's necessary to use different user names for just one user.
It's all but far away to use the same password for all these users.


P.S.: Lubuntu (lx session) is working correctly: reentering the actual session.