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<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE topic PUBLIC "-//OASIS//DTD DITA Topic//EN" "topic.dtd">
<topic xml:lang="en-us" id="hostpowertweaks">
<title>Handling of Host Power Management Events</title>
<body>
<p>Some host power management events are handled by <ph conkeyref="vbox-conkeyref-phrases/product-name"/>. The
actual behavior depends on the platform: </p>
<ul>
<li>
<p><b outputclass="bold">Host Suspends.</b> This event is generated when the host is about
to suspend, that is, the host saves the state to some nonvolatile storage and powers off. </p>
<p>
This event is currently only handled on Windows hosts and Mac
OS X hosts. When this event is generated, <ph conkeyref="vbox-conkeyref-phrases/product-name"/> will
pause all running VMs.
</p>
</li>
<li>
<p><b outputclass="bold">Host Resumes.</b> This event is
generated when the host woke up from the suspended state.
</p>
<p>This event is currently only handled on Windows hosts and Mac OS X hosts. When this event is generated, <ph
conkeyref="vbox-conkeyref-phrases/product-name"/> will resume all VMs which are where paused before. </p>
</li>
<li>
<p><b outputclass="bold">Battery Low.</b> The battery
level reached a critical level, usually less than 5 percent
charged.
</p>
<p>This event is currently only handled on Windows hosts and Mac OS X hosts. When this event is generated, <ph
conkeyref="vbox-conkeyref-phrases/product-name"/> will save the state and terminate all VMs in preparation
of a potential host powerdown. </p>
<p>The behavior can be configured. By executing the following command, no VM is saved: </p>
<pre xml:space="preserve">$ VBoxManage setextradata global "VBoxInternal2/SavestateOnBatteryLow" 0</pre>
<p>This is a global setting as well as a per-VM setting. The per-VM value has higher precedence than the global
value. The following command will save the state of all VMs but will not save the state of VM "foo": </p>
<pre xml:space="preserve">$ VBoxManage setextradata global "VBoxInternal2/SavestateOnBatteryLow" 1
$ VBoxManage setextradata "foo" "VBoxInternal2/SavestateOnBatteryLow" 0</pre>
<p>The first line is actually not required as by default the savestate action is performed. </p>
</li>
</ul>
</body>
</topic>
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