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<a href="#UPower.description" class="shortcut">Description</a>
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<a href="#UPower.implemented-interfaces" class="shortcut">Implemented Interfaces</a>
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<a href="#UPower.properties" class="shortcut">Properties</a>
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<a href="#UPower.signals" class="shortcut">Signals</a>
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<div class="refentry">
<a name="UPower"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle">org.freedesktop.UPower</span></h2>
<p>org.freedesktop.UPower — UPower interface</p>
</td>
<td valign="top" align="right"></td>
</tr></table></div>
<div class="refsynopsisdiv">
<h2>Methods</h2>
<pre class="synopsis"><a class="link" href="UPower.html#UPower.EnumerateDevices">EnumerateDevices</a> (out 'ao' devices)
<a class="link" href="UPower.html#UPower.AboutToSleep">AboutToSleep</a> (in 's' action)
<a class="link" href="UPower.html#UPower.Suspend">Suspend</a> ()
<a class="link" href="UPower.html#UPower.SuspendAllowed">SuspendAllowed</a> (out 'b' allowed)
<a class="link" href="UPower.html#UPower.Hibernate">Hibernate</a> ()
<a class="link" href="UPower.html#UPower.HibernateAllowed">HibernateAllowed</a> (out 'b' allowed)
</pre>
</div>
<div class="refsect1">
<a name="idp4566376"></a><h2>Signals</h2>
<pre class="synopsis"><a class="link" href="UPower.html#UPower::DeviceAdded">DeviceAdded</a> ('o' device)
<a class="link" href="UPower.html#UPower::DeviceRemoved">DeviceRemoved</a> ('o' device)
<a class="link" href="UPower.html#UPower::DeviceChanged">DeviceChanged</a> ('o' device)
<a class="link" href="UPower.html#UPower::Changed">Changed</a> ()
<a class="link" href="UPower.html#UPower::Sleeping">Sleeping</a> ()
<a class="link" href="UPower.html#UPower::NotifySleep">NotifySleep</a> ('s' action)
<a class="link" href="UPower.html#UPower::Resuming">Resuming</a> ()
<a class="link" href="UPower.html#UPower::NotifyResume">NotifyResume</a> ('s' action)
</pre>
</div>
<div class="refsect1">
<a name="idp306824"></a><h2>Implemented Interfaces</h2>
<p>
Objects implementing org.freedesktop.UPower also implements
org.freedesktop.DBus.Introspectable,
org.freedesktop.DBus.Properties
</p>
</div>
<div class="refsect1">
<a name="idp307880"></a><h2>Properties</h2>
<pre class="synopsis"><a class="link" href="UPower.html#UPower:DaemonVersion">'DaemonVersion'</a> read 's'
<a class="link" href="UPower.html#UPower:CanSuspend">'CanSuspend'</a> read 'b'
<a class="link" href="UPower.html#UPower:CanHibernate">'CanHibernate'</a> read 'b'
<a class="link" href="UPower.html#UPower:OnBattery">'OnBattery'</a> read 'b'
<a class="link" href="UPower.html#UPower:OnLowBattery">'OnLowBattery'</a> read 'b'
<a class="link" href="UPower.html#UPower:LidIsClosed">'LidIsClosed'</a> read 'b'
<a class="link" href="UPower.html#UPower:LidIsPresent">'LidIsPresent'</a> read 'b'
<a class="link" href="UPower.html#UPower:LidForceSleep">'LidForceSleep'</a> read 'b'
<a class="link" href="UPower.html#UPower:IsDocked">'IsDocked'</a> read 'b'
</pre>
</div>
<div class="refsect1">
<a name="idp312264"></a><h2>Description</h2>
<p>
</p>
<p>
The UPower service is available via the system message
bus. To access the service, use
the <code class="literal">org.freedesktop.UPower</code> interface on
the <code class="literal">/org/freedesktop/UPower</code> object on
the D-Bus system bus service with the well-known
name <code class="literal">org.freedesktop.UPower</code>.
</p>
<p>
</p>
<p>
</p>
<div class="informalexample"><pre class="programlisting">
$ dbus-send --print-reply \
--system \
--dest=org.freedesktop.UPower \
/org/freedesktop/UPower \
org.freedesktop.UPower.EnumerateDevices
method return sender=:1.386 -> dest=:1.451 reply_serial=2
array [
object path "/org/freedesktop/UPower/devices/line_power_AC"
object path "/org/freedesktop/UPower/devices/battery_BAT0"
]
</pre></div>
<p>
</p>
<p>
</p>
</div>
<div class="refsect1">
<a name="idp315880"></a><h2>Details</h2>
<div class="refsect2">
<a name="idp316368"></a><h3>
<a name="UPower.EnumerateDevices"></a>EnumerateDevices ()</h3>
<pre class="programlisting">EnumerateDevices (out 'ao' devices)</pre>
</div>
<p>
Enumerate all power objects on the system.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>devices</code></em>:</span></p></td>
<td>An array of object paths for devices.</td>
</tr></tbody>
</table></div>
<hr>
<div class="refsect2">
<a name="idp318952"></a><h3>
<a name="UPower.AboutToSleep"></a>AboutToSleep ()</h3>
<pre class="programlisting">AboutToSleep (in 's' action)</pre>
</div>
<p>
This method tells UPower that the Suspend() or Hibernate() method
is about to be called.
This allows UPower to emit the Suspending signal whilst
session activities are happening that have to be done before the
suspend process is started.
</p>
<p>
This method would typically be called by the session power
management daemon, before it locks the screen and waits for the
screen to fade to black.
The session power management component would then call Suspend() or
Hibernate() when these syncronous tasks have completed.
</p>
<p>
If this method is not called than nothing bad will happen and
Suspend() or Hibernate() will block for the required second.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>action</code></em>:</span></p></td>
<td>
The sleep action type, e.g. <code class="literal">suspend</code> or
<code class="literal">hibernate</code>.
</td>
</tr></tbody>
</table></div>
<hr>
<div class="refsect2">
<a name="idp27920"></a><h3>
<a name="UPower.Suspend"></a>Suspend ()</h3>
<pre class="programlisting">Suspend ()</pre>
</div>
<p>
Suspends the computer into a low power state.
System state is not preserved if the power is lost.
</p>
<p>
If AboutToRequestSleep() has not been called then UPower will send
the Sleeping() signal and block for one second.
</p>
<p>
If AboutToRequestSleep() has been called less than one second
before this method is called then UPower will block for the
remaining time to complete one second of delay.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody></tbody>
</table></div>
<hr>
<div class="refsect2">
<a name="idp30704"></a><h3>
<a name="UPower.SuspendAllowed"></a>SuspendAllowed ()</h3>
<pre class="programlisting">SuspendAllowed (out 'b' allowed)</pre>
</div>
<p>
Check if the caller has (or can get) the PolicyKit privilege to call
<code class="function">Suspend</code>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>allowed</code></em>:</span></p></td>
<td>TRUE if allowed, otherwise FALSE</td>
</tr></tbody>
</table></div>
<hr>
<div class="refsect2">
<a name="idp33936"></a><h3>
<a name="UPower.Hibernate"></a>Hibernate ()</h3>
<pre class="programlisting">Hibernate ()</pre>
</div>
<p>
Hibernates the computer into a low power state.
System state is preserved if the power is lost.
</p>
<p>
If AboutToRequestSleep() has not been called then UPower will send
the Sleeping() signal and block for one second.
</p>
<p>
If AboutToRequestSleep() has been called less than one second
before this method is called then UPower will block for the
remaining time to complete one second of delay.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody></tbody>
</table></div>
<hr>
<div class="refsect2">
<a name="idp36728"></a><h3>
<a name="UPower.HibernateAllowed"></a>HibernateAllowed ()</h3>
<pre class="programlisting">HibernateAllowed (out 'b' allowed)</pre>
</div>
<p>
Check if the caller has (or can get) the PolicyKit privilege to call
<code class="function">Hibernate</code>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>allowed</code></em>:</span></p></td>
<td>TRUE if allowed, otherwise FALSE</td>
</tr></tbody>
</table></div>
</div>
<div class="refsect1">
<a name="idp40040"></a><h2>Signal Details</h2>
<div class="refsect2">
<a name="idp40536"></a><h3>
<a name="UPower::DeviceAdded"></a>The DeviceAdded signal</h3>
<pre class="programlisting">DeviceAdded ('o' device)</pre>
</div>
<p>
Emitted when a device is added.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>device</code></em>:</span></p></td>
<td>Object path of device that was added.</td>
</tr></tbody>
</table></div>
<hr>
<div class="refsect2">
<a name="idp4010880"></a><h3>
<a name="UPower::DeviceRemoved"></a>The DeviceRemoved signal</h3>
<pre class="programlisting">DeviceRemoved ('o' device)</pre>
</div>
<p>
Emitted when a device is removed.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>device</code></em>:</span></p></td>
<td>Object path of device that was removed.</td>
</tr></tbody>
</table></div>
<hr>
<div class="refsect2">
<a name="idp4013368"></a><h3>
<a name="UPower::DeviceChanged"></a>The DeviceChanged signal</h3>
<pre class="programlisting">DeviceChanged ('o' device)</pre>
</div>
<p>
Emitted when a device changed.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>device</code></em>:</span></p></td>
<td>Object path of device that was changed.</td>
</tr></tbody>
</table></div>
<hr>
<div class="refsect2">
<a name="idp4015880"></a><h3>
<a name="UPower::Changed"></a>The Changed signal</h3>
<pre class="programlisting">Changed ()</pre>
</div>
<p>
Emitted when one or more properties on the object changes.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody></tbody>
</table></div>
<hr>
<div class="refsect2">
<a name="idp4017816"></a><h3>
<a name="UPower::Sleeping"></a>The Sleeping signal</h3>
<pre class="programlisting">Sleeping ()</pre>
</div>
<p>
This signal is sent when the session is about to be suspended or
hibernated.
</p>
<p>
This signal is DEPRECATED. Use NotifySleep() instead.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody></tbody>
</table></div>
<hr>
<div class="refsect2">
<a name="idp4020080"></a><h3>
<a name="UPower::NotifySleep"></a>The NotifySleep signal</h3>
<pre class="programlisting">NotifySleep ('s' action)</pre>
</div>
<p>
This signal is sent when the session is about to be suspended or
hibernated.
Session and system programs have one second to do anything required
before the sleep action is taken (such as sending out Avahi or
Jabber messages).
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>action</code></em>:</span></p></td>
<td>
The sleep action type, e.g. suspend,
hibernate or hybrid.
</td>
</tr></tbody>
</table></div>
<hr>
<div class="refsect2">
<a name="idp4022976"></a><h3>
<a name="UPower::Resuming"></a>The Resuming signal</h3>
<pre class="programlisting">Resuming ()</pre>
</div>
<p>
This signal is sent when the session has just returned from
Suspend() or Hibernate().
</p>
<p>
This signal is DEPRECATED. Use NotifyResume() instead.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody></tbody>
</table></div>
<hr>
<div class="refsect2">
<a name="idp4025248"></a><h3>
<a name="UPower::NotifyResume"></a>The NotifyResume signal</h3>
<pre class="programlisting">NotifyResume ('s' action)</pre>
</div>
<p>
This signal is sent when the session has just returned from
Suspend() or Hibernate().
Session and system programs can then do anything required (such as
sending out Avahi or Jabber messages).
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>action</code></em>:</span></p></td>
<td>
The sleep action type, e.g. suspend,
hibernate or hybrid.
</td>
</tr></tbody>
</table></div>
</div>
<div class="refsect1">
<a name="idp4028136"></a><h2>Property Details</h2>
<div class="refsect2">
<a name="idp4028616"></a><h3>
<a name="UPower:DaemonVersion"></a>The "DaemonVersion" property</h3>
<pre class="programlisting">'DaemonVersion' read 's'
</pre>
</div>
<p>
Version of the running daemon, e.g. <code class="literal">002</code>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody></tbody>
</table></div>
<hr>
<div class="refsect2">
<a name="idp4030720"></a><h3>
<a name="UPower:CanSuspend"></a>The "CanSuspend" property</h3>
<pre class="programlisting">'CanSuspend' read 'b'
</pre>
</div>
<p>
Whether the system is able to suspend.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody></tbody>
</table></div>
<hr>
<div class="refsect2">
<a name="idp4032472"></a><h3>
<a name="UPower:CanHibernate"></a>The "CanHibernate" property</h3>
<pre class="programlisting">'CanHibernate' read 'b'
</pre>
</div>
<p>
Whether the system is able to hibernate.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody></tbody>
</table></div>
<hr>
<div class="refsect2">
<a name="idp4034240"></a><h3>
<a name="UPower:OnBattery"></a>The "OnBattery" property</h3>
<pre class="programlisting">'OnBattery' read 'b'
</pre>
</div>
<p>
Indicates whether the system is running on battery power.
This property is provided for convenience.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody></tbody>
</table></div>
<hr>
<div class="refsect2">
<a name="idp4036032"></a><h3>
<a name="UPower:OnLowBattery"></a>The "OnLowBattery" property</h3>
<pre class="programlisting">'OnLowBattery' read 'b'
</pre>
</div>
<p>
Indicates whether the system is running on battery power and if the battery is critically low.
This property is provided for convenience.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody></tbody>
</table></div>
<hr>
<div class="refsect2">
<a name="idp4037904"></a><h3>
<a name="UPower:LidIsClosed"></a>The "LidIsClosed" property</h3>
<pre class="programlisting">'LidIsClosed' read 'b'
</pre>
</div>
<p>
Indicates if the laptop lid is closed where the display cannot be seen.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody></tbody>
</table></div>
<hr>
<div class="refsect2">
<a name="idp4039856"></a><h3>
<a name="UPower:LidIsPresent"></a>The "LidIsPresent" property</h3>
<pre class="programlisting">'LidIsPresent' read 'b'
</pre>
</div>
<p>
If the system has a lid device.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody></tbody>
</table></div>
<hr>
<div class="refsect2">
<a name="idp4041776"></a><h3>
<a name="UPower:LidForceSleep"></a>The "LidForceSleep" property</h3>
<pre class="programlisting">'LidForceSleep' read 'b'
</pre>
</div>
<p>
If the system really has to sleep when the lid is closed.
Some laptops actually melt (!) if the lid is closed and the
computer keeps running. We blacklist those, and do something
sane for the other machines.
</p>
<p>
This allows us to set the default session policy to not
suspend on lid close if the laptop is docked, and be sure
the machine is not going to melt.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody></tbody>
</table></div>
<hr>
<div class="refsect2">
<a name="idp4044304"></a><h3>
<a name="UPower:IsDocked"></a>The "IsDocked" property</h3>
<pre class="programlisting">'IsDocked' read 'b'
</pre>
</div>
<p>
If the system is currently docked.
Note: the "is-docked" value is the result of a heuristic,
which may involve testing the display output.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody></tbody>
</table></div>
</div>
</div>
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