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Surface Brightness Control is designed to help reduce thermal load and lower the overall carbon footprint for deployed Surface devices. If you plan to get only this tool from the download page, select the file SurfaceBrightnessControlv1.16.137.0.msi in the available list. Description Set the brightness of the display to a desired level. Your device will revert to its previous brightness setting/level once the app is closed. This app demonstrates the Windows.Graphics.Display.BrightnessOverride API.
If you have Windows Vista or Windows 7, try one of the options below to increase screen brightness while on battery power. Click the power or battery icon in the Systray. Select the High performance option to increase screen brightness. Display Brightness is a simple tool that aims to help you modify the brightness of your PC screen. Once installed, the software will place a brightness icon in the toolbar at the bottom of your screen, making adjusting your screen's brightness a one-step process. Using Microsoft Basic Display Adapter might solve the screen brightness control problem, however, drivers from the manufacturer usually provide a faster performance, higher screen resolution and other additional graphical features. To use Microsoft Basic Display Adapter, go to Device Manager, find 'Display adapters' and expand it.
Some OEM systems have internal displays that are connected using external connectors such as HDMI. For those configurations, Windows has the ability to designate exactly one display panel to support the system software brightness control.This feature only allows OEMs to indicate to Windows that an external connector display supports brightness control; OEMs must still implement the hardware brightness control and integrate that with the graphics driver as they would for an integrated connector display. This feature also does not support the ability to control the individual panel brightness on multiple display panels.
General requirements
A new DWORD registry value will be added: “BrightnessControl”.Registry Path: HKLMSYSTEMCurrentControlSetControlClass{4D36E96E-E325-11CE-BFC1-08002BE10318}XXXXWhere XXXX is for the targeted individual display.
- The first bit in this registry value defines the non-internal monitor brightness control support.
- The second bit defines an ACPI override that forces ACPI brightness to be used.
- The remaining 30bits are reserved and must be zero.
OEMs that would like to enable brightness control on a non-internal panel must ship their own monitor.inf (see sample inf below) and set this registry value appropriately.
OEMs should only define the “BrightnessControl” registry value when it is required.
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The brightness support control override (the first bit) should only be used on a system which does not have an internal display on an internal connector type on any display adapter. If a system does have an internal display on an internal connector type, then the first enumerated display will receive the brightness control.
ACPI brightness override
The ACPI brightness override is not the preferred mechanism to use for brightness control, but is included for completeness, in situations where there is no other option for brightness control.
The ACPI override (the second bit) is valid on both internal and external displays but must only be applied to exactly one display on the system.
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The ACPI override is intended to be used in conjunction with the brightness target override, and only when the display driver does not already provide brightness support. This allows OEMs to implement their own display backlight control via ACPI.
A secondary use for the ACPI override is during OS/driver development when brightness support fails on mobile systems, which can happen for several common reasons. In this case, the ACPI override is intended only as an interim solution; the driver brightness control should be used for the finished product.
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In the case where this registry value is set for external connectors, the OS will limit the system to one exposed brightness control.
Sample MONITOR.INF file fragment
The following is an incomplete sample INF that outlines the above:
Note
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OEMs need to provide a monitor.inf file that has the proper hardware ID in order to ensure that the generic Microsoft monitor.inf is not used.