| 1 | <?xml version='1.0' encoding='UTF-8'?>
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| 2 | <!DOCTYPE topic PUBLIC "-//OASIS//DTD DITA Topic//EN" "topic.dtd">
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| 3 | <topic xml:lang="en-us" id="hostpowertweaks">
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| 4 | <title>Handling of Host Power Management Events</title>
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| 5 |
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| 6 | <body>
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| 7 | <p>
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| 8 | Some host power management events are handled by Oracle VM VirtualBox.
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| 9 | The actual behavior depends on the platform:
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| 10 | </p>
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| 11 | <ul>
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| 12 | <li>
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| 13 | <p><b outputclass="bold">Host Suspends.</b> This event is
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| 14 | generated when the host is about to suspend, that is, the host
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| 15 | saves the state to some non-volatile storage and powers off.
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| 16 | </p>
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| 17 | <p>
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| 18 | This event is currently only handled on Windows hosts and Mac
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| 19 | OS X hosts. When this event is generated, Oracle VM VirtualBox will
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| 20 | pause all running VMs.
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| 21 | </p>
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| 22 | </li>
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| 23 | <li>
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| 24 | <p><b outputclass="bold">Host Resumes.</b> This event is
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| 25 | generated when the host woke up from the suspended state.
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| 26 | </p>
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| 27 | <p>
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| 28 | This event is currently only handled on Windows hosts and Mac
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| 29 | OS X hosts. When this event is generated, Oracle VM VirtualBox will
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| 30 | resume all VMs which are where paused before.
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| 31 | </p>
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| 32 | </li>
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| 33 | <li>
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| 34 | <p><b outputclass="bold">Battery Low.</b> The battery
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| 35 | level reached a critical level, usually less than 5 percent
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| 36 | charged.
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| 37 | </p>
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| 38 | <p>
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| 39 | This event is currently only handled on Windows hosts and Mac
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| 40 | OS X hosts. When this event is generated, Oracle VM VirtualBox will
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| 41 | save the state and terminate all VMs in preparation of a
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| 42 | potential host powerdown.
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| 43 | </p>
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| 44 | <p>
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| 45 | The behavior can be configured. By executing the following
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| 46 | command, no VM is saved:
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| 47 | </p>
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| 48 | <pre xml:space="preserve">$ VBoxManage setextradata global "VBoxInternal2/SavestateOnBatteryLow" 0</pre>
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| 49 | <p>
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| 50 | This is a global setting as well as a per-VM setting. The
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| 51 | per-VM value has higher precedence than the global value. The
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| 52 | following command will save the state of all VMs but will not
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| 53 | save the state of VM "foo":
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| 54 | </p>
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| 55 | <pre xml:space="preserve">$ VBoxManage setextradata global "VBoxInternal2/SavestateOnBatteryLow" 1
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| 56 | $ VBoxManage setextradata "foo" "VBoxInternal2/SavestateOnBatteryLow" 0</pre>
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| 57 | <p>
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| 58 | The first line is actually not required as by default the
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| 59 | savestate action is performed.
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| 60 | </p>
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| 61 | </li>
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| 62 | </ul>
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| 63 | </body>
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| 64 |
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| 65 | </topic>
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