Force Allow Dim When External Display Connected: registry value ForceAllowDimWhenExternalDisplayConnectedComputerHKLM\Software\Policies\Microsoft\HumanPresence

Policy ID: ForceAllowDimWhenExternalDisplayConnected
Scope: Computer Configuration
Supported on: At least Windows 10
Source: Administrative Templates (.admx) for Windows 11 2026 Update (26H2) (version 1.0)
Category: Windows Components › Human Presence

Registry

ForceAllowDimWhenExternalDisplayConnected

-Computer

HKLM\Software\Policies\Microsoft\HumanPresence Current key

ForceAllowDimWhenExternalDisplayConnected

REG_DWORDComputer

HKLM\Software\Policies\Microsoft\HumanPresence Current key

Enabled value: Depends on the option value
Element: Choose one of the following actions

Options
Item	Stored value
Defaults to user choice	0
Forced Checked	1
Forced Unchecked	2

Apply with .reg · CMD · PowerShell

.reg

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\HumanPresence]

; Options (use only one)
; Defaults to user choice
"ForceAllowDimWhenExternalDisplayConnected"=dword:00000000
; Forced Checked
"ForceAllowDimWhenExternalDisplayConnected"=dword:00000001
; Forced Unchecked
"ForceAllowDimWhenExternalDisplayConnected"=dword:00000002

CMD

:: Options (use only one)

:: Defaults to user choice
reg add "HKLM\Software\Policies\Microsoft\HumanPresence" /v "ForceAllowDimWhenExternalDisplayConnected" /t REG_DWORD /d 0 /f
:: Forced Checked
reg add "HKLM\Software\Policies\Microsoft\HumanPresence" /v "ForceAllowDimWhenExternalDisplayConnected" /t REG_DWORD /d 1 /f
:: Forced Unchecked
reg add "HKLM\Software\Policies\Microsoft\HumanPresence" /v "ForceAllowDimWhenExternalDisplayConnected" /t REG_DWORD /d 2 /f

PowerShell

# Common: create the key
New-Item -Path 'HKLM:\Software\Policies\Microsoft\HumanPresence' -Force | Out-Null

# Options (use only one)
# Defaults to user choice
New-ItemProperty -Path 'HKLM:\Software\Policies\Microsoft\HumanPresence' -Name 'ForceAllowDimWhenExternalDisplayConnected' -PropertyType DWord -Value 0 -Force | Out-Null
# Forced Checked
New-ItemProperty -Path 'HKLM:\Software\Policies\Microsoft\HumanPresence' -Name 'ForceAllowDimWhenExternalDisplayConnected' -PropertyType DWord -Value 1 -Force | Out-Null
# Forced Unchecked
New-ItemProperty -Path 'HKLM:\Software\Policies\Microsoft\HumanPresence' -Name 'ForceAllowDimWhenExternalDisplayConnected' -PropertyType DWord -Value 2 -Force | Out-Null