[Bug 264329] print/hplip-plugin hp-systray excessive use of CPU, and not appearing in the system tray

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=264329

            Bug ID: 264329
           Summary: print/hplip-plugin hp-systray excessive use of CPU,
                    and not appearing in the system tray
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: tijl@FreeBSD.org
          Reporter: grahamperrin@gmail.com
          Assignee: tijl@FreeBSD.org
             Flags: maintainer-feedback?(tijl@FreeBSD.org)

Created attachment 234308
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=234308&action=edit
Screenshot: htop and other utilities; preparing to kill hp-systray

After I sign in (to KDE Plasma), on a notebook with four CPUs, overall
performance is poor until I kill: 

    hp-systray

The attached screenshot shows me preparing to kill the process tree with htop. 

Not shown in this particular shot: the excessive use of (one) CPU, by
hp-systray, that is often observable in this situation. 

----

% pkg info -x hplip
hplip-3.22.4
% pkg -vv | grep -e url -e enabled
    url             :
"pkg+http://pkg0.pkt.freebsd.org/FreeBSD:14:amd64/latest",
    enabled         : yes,
    url             :
"https://alpha.pkgbase.live/current/FreeBSD:14:amd64/latest",
    enabled         : no,
    url             : "file:///usr/local/poudriere/data/packages/main-default",
    enabled         : yes,
% uname -aKU
FreeBSD mowa219-gjp4-8570p-freebsd 14.0-CURRENT FreeBSD 14.0-CURRENT #12
main-n255769-f16e38162c7-dirty: Tue May 24 11:48:57 BST 2022    
root@mowa219-gjp4-8570p-freebsd:/usr/obj/usr/src/amd64.amd64/sys/GENERIC-NODEBUG
amd64 1400059 1400059
% grep hp-systray /var/log/messages
May 25 10:02:09 mowa219-gjp4-8570p-freebsd /hp-systray[67590]:
hp-systray[67449]: error: dbus failed to load (python-dbus ver. 0.80+
required). Exiting...
May 25 23:01:31 mowa219-gjp4-8570p-freebsd /hp-systray[3302]: hp-systray[3174]:
error: dbus failed to load (python-dbus ver. 0.80+ required). Exiting...
May 26 09:09:21 mowa219-gjp4-8570p-freebsd /hp-systray[3498]: hp-systray[3372]:
error: dbus failed to load (python-dbus ver. 0.80+ required). Exiting...
May 26 18:28:38 mowa219-gjp4-8570p-freebsd /hp-systray[3418]: hp-systray[3254]:
error: dbus failed to load (python-dbus ver. 0.80+ required). Exiting...
May 28 21:15:30 mowa219-gjp4-8570p-freebsd /hp-systray[3617]: hp-systray[3494]:
error: dbus failed to load (python-dbus ver. 0.80+ required). Exiting...
May 29 04:54:30 mowa219-gjp4-8570p-freebsd /hp-systray[34630]:
hp-systray[34481]: error: dbus failed to load (python-dbus ver. 0.80+
required). Exiting...
May 29 05:27:08 mowa219-gjp4-8570p-freebsd /hp-systray[3633]: hp-systray[3480]:
error: dbus failed to load (python-dbus ver. 0.80+ required). Exiting...
% pkg info -x py38-dbus
py38-dbus-1.2.18
%

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