'''Test safe shutdown'''
<pre> xoff
* xoff is safe shutdown command
* press button 1-2 seconds to reboot
* press button 3 seconds to safe shutdown,
* press 7-8 seconds to force shutdown.
</pre>
'''uninstall'''
'''Test safe shutdown'''
<pre> xoff
* xoff is safe shutdown command
* press button 1-2 seconds to reboot
* press button 3 seconds to safe shutdown,
* press 7-8 seconds to force shutdown.
</pre>
'''uninstall'''