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Starting with Windows 8, the Windows operating system includes an in-box sensor HID Class driver (SensorsHIDClassDriver.dll), that supports eleven types of sensors that communicate using the HID transport.
Here is a list of the supported sensors:
- Accelerometer 3D
- Ambient Light
- Ambient Temperature
- Atmospheric Pressure
- Compass 3D
- Device Orientation
- Gyroscope 3D
- Inclinometer 3D
The following illustration depicts the flow of data back and forth from two sensor applications down through the driver stack and, finally, to the hardware itself.
Support for custom sensors
In addition to the eleven sensors covered in the previous lists, the class driver also supports a Custom class. This class allows a sensor manufacturer to integrate a device not found in the previous list: For example, a carbon monoxide sensor. The custom sensor presents itself to the sensor API as a custom device with unique properties.
Architecture and overview
If you are creating the firmware for a compatible sensor, you’ll need a basic understanding of the I/O model supported by the class driver.
- The sensor sends either a feature report or an input report to the HID class driver. A feature report is sent in response to a request from the driver. This report contains property data including the sensor’s change-sensitivity setting, its report interval, and its reporting state. An input report is sent either upon request, or asynchronously in response to an event. This report contains the actual sensor data. For example, for an accelerometer, the report contains the G-forces along the x-, y-, and z-axes).
- The HID class driver sends feature reports to the sensor. For example, when the application requests a new change sensitivity or report interval, the driver packages these values into a feature report and uses this report to send the request to the sensor’s firmware.
The following diagram illustrates the I/O model:
Sample Report Descriptor
If your sensor supports one of the seven categories native to the class driver, its firmware will need to support specific feature and input reports. The feature reports include a sensor’s current reporting state, its status, change sensitivity, and reporting interval (in addition to other possible properties). The input reports contain sensor readings: True or False for a switch, G-force values for an accelerometer or LUX for an ambient light sensor.
Sample accelerometer feature report
The following code example shows the HID feature report for the accelerometer. Note the self-descriptive nature of this report. It includes minimum and maximum values and the count and size of individual fields.
Sample accelerometer input report
The following code example shows the HID input report for the same device. Again, note the self-descriptive nature of the fields in this report.
When you use a Surface Laptop device, you experience either or both of the following symptoms:
After several hours of use, the device seems to stop responding, and the screen may appear black. While this issue occurs, you may still hear the fan running inside the device.
The device crashes and displays the following error message on a blue screen:
Ambient Driver Updater
These symptoms occur consistently. Therefore, if you regularly use your Surface Laptop, you might experience these symptoms frequently.
This problem may occur because of a memory leak in the Surface Laptop Ambient Light Sensor driver.
On a Surface Laptop (1st Gen), the affected driver is the following:
Intersil Ambient Light Sensor (HID), version 220.127.116.11
On Surface Laptop 2, the affected driver is the following:
Surface Intersil Ambient Light Sensor (HID), version 18.104.22.168 or 22.214.171.124
Microsoft has released the following driver to resolve this issue:
Surface Intersil Ambient Light Sensor (HID), version 126.96.36.199
This driver update will be installed when you check for updates by using Windows Update. For more information about Surface Laptop updates, see the following articles:
If you previously disabled this driver to work around this issue, installing the update will re-enable the driver automatically. If the driver does not get re-enabled automatically, you can re-enable it manually. To do this, follow these steps:
Ambient Driver Vs
In Control Panel, open the Device Manager item.
Expand System devices.
Locate the appropriate driver for the Surface Laptop Ambient Light Sensor driver. Depending on which version of the driver you have installed, the driver will be named Intersil Ambient Light Sensor (HID) or Surface Intersil Ambient Light Sensor (HID).
Right-click the driver name, and select Enable device.
Nvidia Driver Ambient Occlusion
When you experience this problem, nonpaged pool memory usage continues to increase until all the physical memory is used (8 GB or 16 GB, depending on your device model). You can verify that this is occurring by opening Task Manager, and watching on the Performance tab to see whether the Non-paged pool memory value continuously increases.