Dim external monitor brightness

Specified the period of inactivity before client computer automatically reduces external monitor brightness together with the brightness level when display brightness dimmed.

You can specify the period of inactivity in seconds.

This setting is not supported unless both client computer and external monitor supports Display Data Channel/Command Interface (DDC/CI).

Supported on:
Dim display after:

Registry HiveHKEY_LOCAL_MACHINE
Registry PathSoftware\Policies\Lenovo\PWRMGRV\Global
Value NameDimExternalDisplayTimer
Value TypeREG_DWORD
Default Value900
Min Value900
Max Value4294967280
Dimmed display brightness:

Registry HiveHKEY_LOCAL_MACHINE
Registry PathSoftware\Policies\Lenovo\PWRMGRV\Global
Value NameDimExternalDisplayLevel
Value TypeREG_DWORD
Default Value0
Min Value
Max Value100

pmvgpo.admx

Administrative Templates (Computers)

Administrative Templates (Users)