[Bug 226212] Not allowed to make system changes in KDE

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=226212

            Bug ID: 226212
           Summary: Not allowed to make system changes in KDE
           Product: Base System
           Version: 11.1-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: misc
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: slava at planetslav.ca

Created attachment 191009
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=191009&action=edit
Can't change time/timezone

Hello,

I'm running KDE Plasma desktop 5.12.1 from Area51 on Freebsd 11.1.  Everything
works great and is stable, however I'm not able to make changes to some system
settings which should normally prompt for the root password when required.  On
Freebsd I'm just not being allowed to change them an shown a message "You are
not allowed to save the configuration" (see attached screenshots).  Even if I
make changes, the OK button remains greyed out, so I can't apply them.

>From some searching, it appears that to make system changes from the UI, polkit
is required; I confirmed all the polkit packages for KDE are installed.  I'm
not sure if extra configuration is required, I haven't had this issue on
numerous Linux systems I've used with Plasma desktop and have never had to work
with polkit directly.

I've found this error in the .local/share/sddm/xorg-session.log (this is not
directly related to sddm, the same problem exists if launching startkde from
cli without sddm):

** (process:983): CRITICAL **: polkit_agent_listener_register_with_options:
assertion 'POLKIT_IS_SUBJECT (subject)' failed
"Cannot register authentication agent!"
Authentication agent result: false
Couldn't register listener!

P.S. [ade] from #kde-freebsd sent me

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