So the dbus daemon appears to be a busy little bee... but the buzzing noise is 
getting on my nerves.  I see a lot of this stuff in /var/log/messages:

Apr  7 15:49:49 hestia dbus[1024]: [system] Activating service 
name='org.freedesktop.PackageKit' (using servicehelper)
Apr  7 15:49:49 hestia dbus-daemon[1024]: dbus[1024]: [system] Activating 
service name='org.freedesktop.PackageKit' (using servicehelper)
Apr  7 15:49:49 hestia dbus[1024]: [system] Successfully activated service 
'org.freedesktop.PackageKit'
Apr  7 15:49:49 hestia dbus-daemon[1024]: dbus[1024]: [system] Successfully 
activated service 'org.freedesktop.PackageKit'
Apr  7 15:52:22 hestia dbus[1024]: [system] Activating service 
name='org.kde.powerdevil.backlighthelper' (using servicehelper)
Apr  7 15:52:22 hestia dbus-daemon[1024]: dbus[1024]: [system] Activating 
service name='org.kde.powerdevil.backlighthelper' (using servicehelper)
Apr  7 15:52:22 hestia dbus-daemon[1024]: no kernel backlight interface found
Apr  7 15:52:22 hestia org.kde.powerdevil.backlighthelper: QDBusConnection: 
system D-Bus connection created before QCoreApplication. Application may 
misbehave.
Apr  7 15:52:22 hestia dbus[1024]: [system] Successfully activated service 
'org.kde.powerdevil.backlighthelper'
Apr  7 15:52:22 hestia dbus-daemon[1024]: dbus[1024]: [system] Successfully 
activated service 'org.kde.powerdevil.backlighthelper'
Apr  7 15:53:06 hestia dbus[1024]: [system] Activating service 
name='org.kde.powerdevil.backlighthelper' (using servicehelper)
Apr  7 15:53:06 hestia dbus-daemon[1024]: dbus[1024]: [system] Activating 
service name='org.kde.powerdevil.backlighthelper' (using servicehelper)
Apr  7 15:53:06 hestia dbus-daemon[1024]: no kernel backlight interface found
Apr  7 15:53:06 hestia org.kde.powerdevil.backlighthelper: QDBusConnection: 
system D-Bus connection created before QCoreApplication. Application may 
misbehave.
Apr  7 15:53:06 hestia dbus[1024]: [system] Successfully activated service 
'org.kde.powerdevil.backlighthelper'
Apr  7 15:53:06 hestia dbus-daemon[1024]: dbus[1024]: [system] Successfully 
activated service 'org.kde.powerdevil.backlighthelper'
Apr  7 15:55:49 hestia dbus[1024]: [system] Activating service 
name='org.freedesktop.PackageKit' (using servicehelper)
Apr  7 15:55:49 hestia dbus-daemon[1024]: dbus[1024]: [system] Activating 
service name='org.freedesktop.PackageKit' (using servicehelper)
Apr  7 15:55:49 hestia dbus[1024]: [system] Successfully activated service 
'org.freedesktop.PackageKit'
Apr  7 15:55:49 hestia dbus-daemon[1024]: dbus[1024]: [system] Successfully 
activated service 'org.freedesktop.PackageKit'
Apr  7 16:01:13 hestia dbus[1024]: [system] Activating service 
name='org.kde.powerdevil.backlighthelper' (using servicehelper)
Apr  7 16:01:13 hestia dbus-daemon[1024]: dbus[1024]: [system] Activating 
service name='org.kde.powerdevil.backlighthelper' (using servicehelper)
Apr  7 16:01:13 hestia dbus-daemon[1024]: no kernel backlight interface found
Apr  7 16:01:13 hestia org.kde.powerdevil.backlighthelper: QDBusConnection: 
system D-Bus connection created before QCoreApplication. Application may 
misbehave.
Apr  7 16:01:13 hestia dbus[1024]: [system] Successfully activated service 
'org.kde.powerdevil.backlighthelper'
Apr  7 16:01:13 hestia dbus-daemon[1024]: dbus[1024]: [system] Successfully 
activated service 'org.kde.powerdevil.backlighthelper'
Apr  7 16:01:49 hestia dbus[1024]: [system] Activating service 
name='org.freedesktop.PackageKit' (using servicehelper)
Apr  7 16:01:49 hestia dbus-daemon[1024]: dbus[1024]: [system] Activating 
service name='org.freedesktop.PackageKit' (using servicehelper)
Apr  7 16:01:49 hestia dbus[1024]: [system] Successfully activated service 
'org.freedesktop.PackageKit'
Apr  7 16:01:49 hestia dbus-daemon[1024]: dbus[1024]: [system] Successfully 
activated service 'org.freedesktop.PackageKit'
Apr  7 16:02:28 hestia dbus[1024]: [system] Activating service 
name='org.kde.powerdevil.backlighthelper' (using servicehelper)
Apr  7 16:02:28 hestia dbus-daemon[1024]: dbus[1024]: [system] Activating 
service name='org.kde.powerdevil.backlighthelper' (using servicehelper)
Apr  7 16:02:28 hestia dbus-daemon[1024]: no kernel backlight interface found
Apr  7 16:02:28 hestia org.kde.powerdevil.backlighthelper: QDBusConnection: 
system D-Bus connection created before QCoreApplication. Application may 
misbehave.
Apr  7 16:02:28 hestia dbus[1024]: [system] Successfully activated service 
'org.kde.powerdevil.backlighthelper'
Apr  7 16:02:28 hestia dbus-daemon[1024]: dbus[1024]: [system] Successfully 
activated service 'org.kde.powerdevil.backlighthelper'
Apr  7 16:03:42 hestia dbus[1024]: [system] Activating service 
name='org.kde.powerdevil.backlighthelper' (using servicehelper)
Apr  7 16:03:42 hestia dbus-daemon[1024]: dbus[1024]: [system] Activating 
service name='org.kde.powerdevil.backlighthelper' (using servicehelper)
Apr  7 16:03:42 hestia dbus-daemon[1024]: no kernel backlight interface found
Apr  7 16:03:42 hestia org.kde.powerdevil.backlighthelper: QDBusConnection: 
system D-Bus connection created before QCoreApplication. Application may 
misbehave.
Apr  7 16:03:42 hestia dbus[1024]: [system] Successfully activated service 
'org.kde.powerdevil.backlighthelper'
Apr  7 16:03:42 hestia dbus-daemon[1024]: dbus[1024]: [system] Successfully 
activated service 'org.kde.powerdevil.backlighthelper'
Apr  7 16:07:27 hestia dbus[1024]: [system] Activating service 
name='org.kde.powerdevil.backlighthelper' (using servicehelper)
Apr  7 16:07:27 hestia dbus-daemon[1024]: dbus[1024]: [system] Activating 
service name='org.kde.powerdevil.backlighthelper' (using servicehelper)
Apr  7 16:07:27 hestia dbus-daemon[1024]: no kernel backlight interface found
Apr  7 16:07:27 hestia org.kde.powerdevil.backlighthelper: QDBusConnection: 
system D-Bus connection created before QCoreApplication. Application may 
misbehave.
Apr  7 16:07:27 hestia dbus[1024]: [system] Successfully activated service 
'org.kde.powerdevil.backlighthelper'
Apr  7 16:07:27 hestia dbus-daemon[1024]: dbus[1024]: [system] Successfully 
activated service 'org.kde.powerdevil.backlighthelper'
Apr  7 16:07:49 hestia dbus[1024]: [system] Activating service 
name='org.freedesktop.PackageKit' (using servicehelper)
Apr  7 16:07:49 hestia dbus-daemon[1024]: dbus[1024]: [system] Activating 
service name='org.freedesktop.PackageKit' (using servicehelper)
Apr  7 16:07:49 hestia dbus[1024]: [system] Successfully activated service 
'org.freedesktop.PackageKit'
Apr  7 16:07:49 hestia dbus-daemon[1024]: dbus[1024]: [system] Successfully 
activated service 'org.freedesktop.PackageKit'
Apr  7 16:08:42 hestia dbus[1024]: [system] Activating service 
name='org.kde.powerdevil.backlighthelper' (using servicehelper)
Apr  7 16:08:42 hestia dbus-daemon[1024]: dbus[1024]: [system] Activating 
service name='org.kde.powerdevil.backlighthelper' (using servicehelper)
Apr  7 16:08:42 hestia dbus-daemon[1024]: no kernel backlight interface found
Apr  7 16:08:42 hestia org.kde.powerdevil.backlighthelper: QDBusConnection: 
system D-Bus connection created before QCoreApplication. Application may 
misbehave.
Apr  7 16:08:42 hestia dbus[1024]: [system] Successfully activated service 
'org.kde.powerdevil.backlighthelper'
Apr  7 16:08:42 hestia dbus-daemon[1024]: dbus[1024]: [system] Successfully 
activated service 'org.kde.powerdevil.backlighthelper'
Apr  7 16:07:27 hestia dbus[1024]: [system] Activating service 
name='org.kde.powerdevil.backlighthelper' (using servicehelper)
Apr  7 16:07:27 hestia dbus-daemon[1024]: dbus[1024]: [system] Activating 
service name='org.kde.powerdevil.backlighthelper' (using servicehelper)
Apr  7 16:07:27 hestia dbus-daemon[1024]: no kernel backlight interface found
Apr  7 16:07:27 hestia org.kde.powerdevil.backlighthelper: QDBusConnection: 
system D-Bus connection created before QCoreApplication. Application may 
misbehave.
Apr  7 16:07:27 hestia dbus[1024]: [system] Successfully activated service 
'org.kde.powerdevil.backlighthelper'
Apr  7 16:07:27 hestia dbus-daemon[1024]: dbus[1024]: [system] Successfully 
activated service 'org.kde.powerdevil.backlighthelper'
Apr  7 16:07:49 hestia dbus[1024]: [system] Activating service 
name='org.freedesktop.PackageKit' (using servicehelper)
Apr  7 16:07:49 hestia dbus-daemon[1024]: dbus[1024]: [system] Activating 
service name='org.freedesktop.PackageKit' (using servicehelper)
Apr  7 16:07:49 hestia dbus[1024]: [system] Successfully activated service 
'org.freedesktop.PackageKit'
Apr  7 16:07:49 hestia dbus-daemon[1024]: dbus[1024]: [system] Successfully 
activated service 'org.freedesktop.PackageKit'
Apr  7 16:08:42 hestia dbus[1024]: [system] Activating service 
name='org.kde.powerdevil.backlighthelper' (using servicehelper)
Apr  7 16:08:42 hestia dbus-daemon[1024]: dbus[1024]: [system] Activating 
service name='org.kde.powerdevil.backlighthelper' (using servicehelper)
Apr  7 16:08:42 hestia dbus-daemon[1024]: no kernel backlight interface found
Apr  7 16:08:42 hestia org.kde.powerdevil.backlighthelper: QDBusConnection: 
system D-Bus connection created before QCoreApplication. Application may 
misbehave.
Apr  7 16:08:42 hestia dbus[1024]: [system] Successfully activated service 
'org.kde.powerdevil.backlighthelper'
Apr  7 16:08:42 hestia dbus-daemon[1024]: dbus[1024]: [system] Successfully 
activated service 'org.kde.powerdevil.backlighthelper'

Any clues as to how to suppress this garbage, most gratefully received.

Thanks,

Chris

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