/etc/dbus-1/system.d/com.ubuntu.ScreenResolution.Mechanism.conf is in screen-resolution-extra 0.17.1.1~16.04.1.
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 12 13 14 15 16 17 18 19 20 21 | <?xml version="1.0" encoding="UTF-8"?> <!-- -*- XML -*- -->
<!-- Permissions for the configuration backend of screen-resolution-extra. -->
<!DOCTYPE busconfig PUBLIC
"-//freedesktop//DTD D-BUS Bus Configuration 1.0//EN"
"http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd">
<busconfig>
<!--
The root user must be able to own this service. Don't forget to update
/usr/share/dbus-1/system-services/com.ubuntu.ScreenResolution.Mechanism.service
when you believe, that some other user should own this service.
-->
<policy user="root">
<allow own="com.ubuntu.ScreenResolution.Mechanism"/>
</policy>
<policy context="default">
<allow send_destination="com.ubuntu.ScreenResolution.Mechanism"/>
</policy>
</busconfig>
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