Adaptive Brightness (SensrSvc) Service Defaults in Windows 7

Monitors ambient light sensors to detect changes in ambient light and adjust the display brightness. If this service is stopped or disabled, the display brightness will not adapt to lighting conditions.

The Adaptive Brightness service does not exist in:

Default Settings

Startup type: Manual
Display name:Adaptive Brightness
Service name:SensrSvc
Service type:share
Error control:normal
Object:NT AUTHORITY\LocalService
Path:%SystemRoot%\system32\svchost.exe -k LocalServiceAndNoImpersonation
Registry key:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SensrSvc
  • SeChangeNotifyPrivilege

Default Behavior

Adaptive Brightness is a Win32 service. In Windows 7 it won't be started if the user doesn't start it. When the Adaptive Brightness service is started, it is running as NT AUTHORITY\LocalService in a shared process of svchost.exe. Other system components, such as drivers and services, may run in the same process. If Adaptive Brightness fails to start, Windows 7 attempts to write the failure details into Event Log. Then Windows 7 startup should proceed and the user should be notified that the SensrSvc service is not running because of the error.

Restore Default Startup Configuration of Adaptive Brightness

1. Run the Command Prompt as an administrator.

2. Copy the command below, paste it into the command window and press ENTER:

sc config SensrSvc start= demand

3. Close the command window and restart the computer.

The SensrSvc service is using the sensrsvc.dll file that is located in the C:\Windows\system32 directory. If the file is removed or corrupted, read this article to restore its original version from Windows 7 installation media.