The Adaptive Brightness (SensrSvc) service 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 default startup type for this service is Manual. When the Adaptive Brightness service is started in its default configuration, it logs on by using the Local Service account. This service is not dependent on any other system service, nor is any service dependent on it.
This service is supported in all versions of Windows 7except Windows 7 Starter operating system. This service is not included in Windows Server 2008 R2.
For more information about working with this service, see Windows 7 Brightness Control for Integrated Displays.