KVM Windows virtual machines and ACPI unattended shutdown: a recap

Written by Super User on . Posted in Virtualization

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Conclusions

As anticipated, while apparently simple, Windows and ACPI shutdown interactions are quite confusing.

In short:

  • on Windows XP machine you need to enable the "Shutdown: Allow system to be shut down without having to log on" policy (or edit the relative "shutdownwithoutlogon" registry entry) and disable the login screensaver (as per https://support.microsoft.com/en-us/kb/185348)
  • on Windows 7/8/10 or 2008R2/2012R2 you need to disable monitor standby/sleep or you need to issue two ACPI shutdown events

Please note that locked console ignores the shutdown event, requiring a manual guest shutdown (or an automatic one initiated via WMI / guest addition / etc)

Happy shutdown to all yours Windows VM :)

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