/usr/share/glib-2.0/schemas/com.canonical.powerd.gschema.xml is in powerd 0.14+14.04.20140415-0ubuntu1.
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 | <?xml version="1.0" encoding="UTF-8"?>
<schemalist gettext-domain="powerd">
<schema id="com.canonical.powerd" path="/com/canonical/powerd/">
<key name="activity-timeout" type="u">
<range min="5" max="3600"/>
<default>60</default>
<summary>Timeout in seconds for turning off the screen if there is no user activity</summary>
</key>
<key name="dim-timeout" type="u">
<range min="0" max="3600"/>
<default>45</default>
<summary>Timeout in seconds for dimming the screen if there is no user activity. A value of 0 disables auto-dimming.</summary>
</key>
</schema>
</schemalist>
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