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Set HyperV VM to have NumLock set on as default

(2026-07-24)

Problem:

By default, Hyper-V VMs have NumLock disabled. If your workstation has NumLock enabled, clicking into a Hyper-V console will set your NumLock to disabled, a state which remains when you click out of it.

If you use your number pad then this becomes annoying really quickly.

Solution:

This setting has to be changed per-VM, only when the VM is powered off. Run the following powershell as a Hyper-V admin:

function Set-VMNumLock {
  param(
    [Microsoft.HyperV.PowerShell.ComputeResource]$vm,
    [bool]$NumLockEnabled
  )
  # Get underlying settings object with reflection
  $ComputerResourceType = [Microsoft.HyperV.PowerShell.ComputeResource]
  $SettingField = $ComputerResourceType.GetDeclaredField("_settings")
  $settingUpdater = $SettingField.GetValue($vm)

  $vmComputerSystemView = $settingUpdater.GetData([Microsoft.HyperV.Powershell.UpdatePolicy]::EnsureUpdated)
  $vmComputerSystemView.BiosNumLock = $NumLockEnabled
  $vmComputerSystemView.Put()
}

$vm = Get-VM -VMName “IT-LibreNMS”
Set-VMNumLock -vm $vm -NumLockEnabled $true

(Source: Shiyao Wang's Answer on this Server Fault page)

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