Sent message type=method_call sender=n/a destination=org.freedesktop.systemd1 object=/org/freedesktop/systemd1 interface=org.freedesktop.systemd1.Manager member=ListUnitsByPatterns cookie=1 reply_cookie=0 error=n/a
Got message type=method_return sender=n/a destination=n/a object=n/a interface=n/a member=n/a cookie=1 reply_cookie=1 error=n/a
UNIT LOAD ACTIVE SUB DESCRIPTION
proc-sys-fs-binfmt_misc.automount loaded active running Arbitrary Executable File Formats File System Automount Point
sys-devices-pci0000:00-0000:00:02.0-drm-card0-card0\x2deDP\x2d1-intel_backlight.device loaded active plugged /sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-eDP-1/intel_backlight
sys-devices-pci0000:00-0000:00:03.0-sound-card0.device loaded active plugged Haswell-ULT HD Audio Controller
...
Why would D-Bus give Access denied to your call? I didn't find an answer.