This policy setting allows you to specify the brightness of the display when Windows automatically reduces brightness of the display.If you enable this policy setting you must provide a value in percentage indicating the display brightness when Windows automatically reduces brightness of the display.If you disable or do not configure this policy setting users control this setting.
Policy path:
System\Power Management\Video and Display Settings
Scope:
Machine
Supported on:
At least Windows Server 2008 R2 or Windows 7
Registry settings:
HKLM\Software\Policies\Microsoft\Power\PowerSettings\f1fbfde2-a960-4165-9f88-50667911ce96!DCSettingIndex
Filename:
Power.admx