Comment # 3 on bug 1021271 from Neil Rickert

I don't normally notice this "problem".  But I did check for it once, prompted
by a forum post.

If I'm correct, it is an SDDM issue.  Whether this counts as an SDDM bug or an
SDDM feature is not up to me to decide.

I normally use either "lightdm" or "gdm" for login.  And each of those writes a
record to the "utmp" database.  But "sddm" does not write such a record.

If I switch to "sddm" (as I did for testing), I still get an entry.  But it is
written by "yakuake", which I have automatically started for me.  There isn't a
record written by "sddm".

My suggestion:

Any of the following would "solve" your problem:
(1) start "yakuake" in your plasma session;
(2) start "konsole" in your plasma session;
(3) switch to using "lightdm" -- you may have to install it first;
(4) switch to using "gdm" -- you may have to install that first;
(5) switch to using "kdm" -- you may have to install that first.