/usr/share/dbus-1/system-services/com.ubuntu.ScreenResolution.Mechanism.service is in screen-resolution-extra 0.17.1.1~14.04.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 | # Service description of the configuration backend of screen-resolution-extra.
# The service must be run as root for changing Screen Resolution.
#
# IMPORTANT NOTICE: You have to update the service's configuration file
# /etc/dbus-1/system.d/com.ubuntu.ScreenResolution.Mechanism.conf when feeling
# adventurous and trying other user ids for this service.
#
[D-BUS Service]
Name=com.ubuntu.ScreenResolution.Mechanism
Exec=/usr/share/screen-resolution-extra/screenresolution-mechanism
User=root
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