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-->Versions supported
- Windows 10
- Windows 8.1
Applies to
- Device manufacturers of CDC Control devices
Microsoft-provided in-box driver (Usbser.sys) for your Communications and CDC Control device.
In Windows 10, the driver has been rewritten by using the Kernel-Mode Driver Framework that improves the overall stability of the driver.
- Improved PnP and power management by the driver (such as, handling surprise removal).
- Added power management features such as USB Selective Suspend.
In addition, UWP applications can now use the APIs provided by the new Windows.Devices.SerialCommunication namespace that allow apps to talk to these devices.
Usbser.sys installation
Load the Microsoft-provided in-box driver (Usbser.sys) for your Communications and CDC Control device.
Note
If you trying to install a USB device class driver included in Windows, you do not need to download the driver. They are installed automatically. If they are not installed automatically, contact the device manufacturer. For the list of USB device class driver included in Windows, see USB device class drivers included in Windows.
Windows 10
In Windows 10, a new INF, Usbser.inf, has been added to %Systemroot%Inf that loads Usbser.sys as the function device object (FDO) in the device stack. If your device belongs to the Communications and CDC Control device class, Usbser.sys is loaded automatically.You do not need to write your own INF to reference the driver. The driver is loaded based on a compatible ID match similar to other USB device class drivers included in Windows.
USBClass_02
USBClass_02&SubClass_02
- If you want to load Usbser.sys automatically, set the class code to 02 and subclass code to 02 in the Device Descriptor. For more information, see USB communications device class. With this approach, you are not required to distribute INF files for your device because the system uses Usbser.inf.
- If your device specifies class code 02 but a subclass code value other than 02, Usbser.sys does not load automatically. Pnp Manager tries to find a driver. If a suitable driver is not found, the device might not have a driver loaded. In this case, you might have to load your own driver or write an INF that references another in-box driver.
- If your device specifies class and subclass codes to 02, and you want to load another driver instead of Usbser.sys, you have to write an INF that specifies the hardware ID of the device and the driver to install. For examples, look through the INF files included with sample drivers and find devices similar to your device. For information about INF sections, see Overview of INF Files.
Note
Microsoft encourages you to use in-box drivers whenever possible. On mobile editions of Windows, such as Windows 10 Mobile, only drivers that are part of the operating system are loaded. Unlike desktop editions, it is not possible to load a driver through an external driver package. With the new in-box INF, Usbser.sys is automatically loaded if a USB-to-serial device is detected on the mobile device.
Windows 8.1 and earlier versions
In Windows 8.1 and earlier versions of the operating system, Usbser.sys is not automatically loaded when a USB-to-serial device is attached to a computer. To load the driver, you need to write an INF that references the modem INF (mdmcpq.inf) by using the Include directive. The directive is required for instantiating the service, copying inbox binaries, and registering a device interface GUID that applications require to find the device and talk to it. That INF specifies 'Usbser' as a lower filter driver in a device stack.
The INF also needs to specify the device setup class as Modem to use mdmcpq.inf. Under the [Version] section of the INF, specify the Modem and the device class GUID. for details, see System-Supplied Device Setup Classes.
For more information, see this KB article.
Configure selective suspend for Usbser.sys
Starting in Windows 10, Usbser.sys supports USB Selective Suspend. It allows the attached USB-to-serial device to enter a low power state when not in use, while the system remains in the S0 state. When communication with the device resumes, the device can leave the Suspend state and resume Working state. The feature is disabled by default and can be enabled and configured by setting the IdleUsbSelectiveSuspendPolicy entry under this registry key:
To configure power management features of Usbser.sys, you can set IdleUsbSelectiveSuspendPolicy to:
'0x00000001': Enters selective suspend when idle, that is, when there are no active data transfers to or from the device.
'0x00000000': Enters selective suspend only when there are no open handles to the device.
That entry can be added in one of two ways:
Write an INF that references the install INF and add the registry entry in the HW.AddReg section.
Describe the registry entry in an extended properties OS feature descriptor. Add a custom property section that sets the bPropertyName field to a Unicode string, 'IdleUsbSelectiveSuspendPolicy' and wPropertyNameLength to 62 bytes. Set the bPropertyData field to '0x00000001' or '0x00000000'. The property values are stored as little-endian 32-bit integers.
For more information, see Microsoft OS Descriptors.
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Develop Windows applications for a USB CDC device
If you install Usbser.sys for the USB CDC device, here are the application programming model options:
Starting in Windows 10, a Windows app can send requests to Usbser.sys by using the Windows.Devices.SerialCommunication namespace. It defines Windows Runtime classes that can use to communicate with a USB CDC device through a serial port or some abstraction of a serial port. The classes provide functionality to discover such serial device, read and write data, and control serial-specific properties for flow control, such as setting baud rate, signal states.
In Windows 8.1 and earlier versions, you can write a Windows desktop application that opens a virtual COM port and communicates with the device. For more information, see:
Win32 programming model:
.NET framework programming model:
Related topics
When your camera isn't working in Windows 10, it might be missing drivers after a recent update. It's also possible that your anti-virus program is blocking the camera, your privacy settings don't allow camera access for some apps, or there's a problem with the app you want to use.
Looking for other camera info?
Need more info on missing camera rolls? See Fix a missing Camera Roll in Windows 10.
Curious about importing photos? See Import photos and videos from phone to PC.
Before you begin
Before working through the possible solutions listed, do these first:
Check for updates. Select Start , then select Settings > Update & Security > Windows Update > Check for updates. If you see the option to View optional updates, select it to see if there are updates available for your camera. Allow available updates to install, then restart your device when it's ready.
Restart your PC. If you haven't restarted your device since the camera stopped working, you should do so. Select Start , then select Power > Restart. Waking up your device from sleep isn't the same thing as a restart.
Test your camera with the Camera app. Select Start , then choose Camera from the list of apps. If you're asked to allow access to the Camera, select Yes. If the camera works in the Camera app, the problem might be with the app you're trying to use.
Open Camera
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If your camera still doesn’t work, here are some other things to try. For best results, try the possible fixes in the order presented.
Check for a camera switch or button your device
Some laptops and portable devices have a physical switch or button that turns the camera on or off. When turned off, your device won't recognize that there's a camera installed. If your computer has a switch or button, make sure it's in the on position before using your camera.
Check your settings
Give your apps permission
If you recently updated Windows 10, you might need to give apps permission to use the camera. In newer versions of Windows 10, some apps don’t have default access to the camera.
To let your device access the camera, select Start , then select Settings > Privacy > Camera . In Allow access to the camera on this device, if Camera access for this device is turned off, select Change and turn on Camera access for this device.
Note: If camera access for the device is turned off and you can't select Change, you'll need an administrator on the device to turn on camera access for you.
Before any app can access your camera, make sure camera access is turned on for apps in your user account. Make sure that Allow apps to access your camera is turned on.
After allowing access to the camera, go to Choose which Microsoft Store apps can access your camera and turn on camera access for the apps you want. Only apps installed from the Microsoft Store will show in this list.
If you installed the app from the internet, a disc, a USB drive, or your IT administrator installed the app for you, it might not be a Microsoft Store app. To check, go to Allow desktop apps access to your camera and make sure it's turned on. Many video conferencing apps, like Microsoft Teams, are desktop apps that require this setting to be turned on.
To learn how you can configure your camera privacy settings in Windows 10, go to this Windows Community (in English) page.
Check your antivirus software
In your antivirus software settings, look for settings that block access to your camera or permission to use your camera. For help, visit your antivirus software company’s website.
Check your hardware drivers
Try a different USB port and scan for hardware changes
If you're using an external camera, try using it with a different USB port on your device first. If that doesn't work, or your camera is built-in to your device, try this:
Select Start , enter device manager, then select it from the search results.
Find your camera under Cameras, Imaging devices or Sound, video and game controllers.
If you can't find your camera, select the Action menu, then select Scan for hardware changes.
Wait for it to scan and reinstall updated drivers, restart your device, then try opening the Camera app again.
If these steps don't fix your issue, continue to the next steps.
Check for an incompatible camera driver
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Some older cameras that were designed for older devices aren't compatible with Windows 10. Here's how to check if you have if your camera is compatible:
In Device Manager, look for your camera under Cameras, Imaging devices or Sound, video and game controllers.
Press and hold (or right-click) the name of your camera, and then select Properties.
Select the Driver tab, select the Driver Details button, and look for a file name that includes stream.sys. If it’s there, your camera was designed before Windows 7 and you'll have to replace it with a newer camera.
If you don't find a file name that includes stream.sys, continue to the next steps.
Roll back the camera driver
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If your camera stopped working after an update, try these steps:
In Device Manager, press and hold (or right-click) your camera, and then select Properties.
Select the Driver tab, select Roll Back Driver, and then choose Yes. (Some drivers don’t provide this option. If your driver doesn’t have Roll Back Driver available, go ahead to the next fix.)
After the roll back is complete, restart your device, and then try opening the Camera app again.
If rolling back didn’t work or isn’t available, continue to the next steps.
Uninstall your camera driver and scan for hardware changes
In Device Manager, press and hold (or right-click) your camera, and then select Properties.
Select the Driver tab, then select Uninstall Device. Select the check box for Deletethe driver software for this device, then select OK.
In Device Manager, on the Action menu, select Scan for hardware changes.
Wait for it to scan and reinstall updated drivers, restart your PC, and then try opening the Camera app again.
Note: If your camera still doesn’t work, look for help on the camera manufacturer’s website.
Need more help?
If you'd like to learn about the basics of using the camera, see How to use the Camera app.
Find answers in the forums
If the previous solutions don’t work, try searching for similar problems in the Microsoft Community forum for Windows Camera. If you don’t find a solution, go ahead and share details about your experience there, then check back later for responses.
Submit feedback
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If you've tried the steps in this article and don't find a solution that works, use Windows Feedback Hub to file a bug. This helps Microsoft find the root cause of this problem.
Include details about what you were doing, or specific steps you were taking, when the problem occurred. Be sure to use Recreate my problem when you submit your feedback in the Feedback Hub.
For help submitting feedback with Feedback Hub, see Send feedback to Microsoft with the Feedback Hub app.
Related topics
Fix a missing Camera Roll in Windows 10.