Is power management supported for virtual machines running on Hyper-V?

Question

Hello

What I need is the guest virtual machine running on Hyper-V to be able to use power management features including hibernation.

For S1-S4 power management in Hyper-V virtual machines, but encountering an error when enabling hibernate using "powercfg /h on," which says, "The system firmware does not support."

Answer 1

Hi,

Please try the following to see if it works.

1. Disable dynamic memory on the VM since it's incompatible with hibernation.
2. Run the following PowerShell script on the host:

Param (
    [string]$VmName,
    [bool]$Enable = $true
)

# To modify, machine must be off
$Vm = Get-VM -Name $VmName
$Vm | Stop-VM -Force -WarningAction Ignore

$wmiComputerSystem = gwmi -namespace root\virtualization\v2 -query "select * from Msvm_ComputerSystem where ElementName= '$VmName'"
$wmi_vsSettingData = $wmiComputerSystem.GetRelated("Msvm_VirtualSystemSettingData","Msvm_SettingsDefineState",$null,$null, "SettingData", "ManagedElement", $false, $null)
 
Write-Output ("Before: EnableHibernation = " + $wmi_vsSettingData.EnableHibernation)

# $wmi_vsSettingData.EnableHibernation = $Enable  # Doesn't work - says The property 'EnableHibernation' cannot be found on this object
# So, need to munge XML ourselves
[xml]$vsSettingsDataXml = $wmi_vsSettingData.gettext(1)
$EnableHibernationNodes = $vsSettingsDataXml.SelectNodes("/INSTANCE/PROPERTY[@NAME='EnableHibernation']")
$EnableHibernationNodes[0].VALUE=$Enable.ToString()

$wmi_vsSettingDataMgmt = Get-WmiObject -Namespace "root\virtualization\v2" -Class Msvm_VirtualSystemManagementService
$job = $wmi_vsSettingDataMgmt.ModifySystemSettings($vsSettingsDataXml.OuterXml)