Drivers Aja Video Port Devices
For a Microsoft Windows 2000 version of this article, see
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IN THIS TASK
You can develop a custom host controller driver that communicates with the USB host controller extension (UCX) driver. For more information, see Developing Windows drivers for USB host controllers. For handling common function logic for USB devices. For more information, see USB device-side drivers in Windows. For supporting Type-C connectors. The SVID2USB2 USB 2.0 S-Video/Composite video Capture Cable lets you connect devices that output S-Video or Composite video to a computer through an available USB 2.0 port. The cable also features two channel RCA stereo audio inputs that let you capture the audio accompanying the S-Video or Composite video signal. Types of Drivers. Windows device drivers generally come in 2 flavors: Virtual Device Drivers (VXD) and Windows Driver Model (WDM). VxD style drivers are older, and are less compatible, while WDM drivers are supposed to be fully code-compatible all the way back to Windows 98.
- Most video capture software or audio processing software or scanner software need to work directly with the IEEE 1394 Firewire driver and the Firewire driver will never see a Firewire port chipset since it is not built-in to the motherboard or installed in an expansion slot.
- In a driver pair, one driver handles general tasks that are common to a whole collection of devices, while the other driver handles tasks that are specific to an individual device. The drivers that handle device-specific tasks go by a variety of names, including miniport driver, miniclass driver, and minidriver.
Summary
This step-by-step article describes how to force Windows to use a standard VGA mode driver that is included with Windows. This procedure is useful in the following scenario.
If you install Windows on a computer that is using an unsupported video adapter, Windows Setup installs a standard VGA mode driver. However, after you install Windows, you obtain and install a Windows-compatible driver for your video adapter from an original equipment manufacturer (OEM).
In this scenario, the computer may have problems shutting down, or the computer may stop responding (hang). To troubleshoot this problem, you may want remove the new OEM drivers and revert to the standard VGA drivers to determine whether the OEM drivers cause the problem.
This article describes how to remove OEM video drivers and force Windows to use the standard VGA drivers that are included with Windows.
Force Windows to Use the Standard VGA Mode Drivers Without Having to Use Safe Mode
When you install an OEM driver, the Windows installer program copies the OEM installation file (Oemsetup.inf) to the %Systemroot%Inf folder. Setup then renames the Oemsetup.inf file to Oemn.inf, where n is an incremental number for each OEM driver that is installed.
To identify the OEM video-specific Oemn.inf file, you can open each Oemn.inf file in Microsoft Notepad, and then compare it with the original Oemsetup.inf file. After you find a match, move that specific Oemn.inf and Oemn.pnf files to a different location, or rename the files with a different file name extension.
After you locate the matching .inf files, move the Oemn.inf and Oemn.pnf to a different folder.
In Device Manager, right-click your video adapter, and then click Uninstall to remove the video adapter.
Restart your computer.
After you log on, you receive a message stating that new hardware has been found and that it is a VGA compatible video controller. The Found New Hardware Wizard starts.Click Next.
Click Search for suitable driver, and then click Next.
Click to clear all of the search option check boxes, and then click Next.
Click Disable the device, and then click Finish.
After you finish steps 1 through 7, Windows uses the Vga.sys generic video driver. This is the same VGA driver that Windows uses in Safe mode.
If the computer becomes stable or shuts down in a typical manner while you are using the standard VGA driver, you may have to contact the OEM driver vendor to report the problems that you have when you use the OEM driver. You may also have to obtain and install a newer driver (if one is available) that resolves these problems.
To restore the OEM drivers, follow these steps:
Move the Oemn.inf and Oemn.pnf files back to the %Systemroot%Inf folder.
Use Device Manager to remove the VGA video adapter, and then restart the computer.
Windows Plug and Play locates the OEM video adapter and reinstalls the OEM drivers automatically.
NOTE: If you press F8, and then click Enable VGA Mode on the Windows Startup menu, Windows starts with a screen area of 640 by 480 pixels with low 8-bit color and may use an OEM video driver, not the standard VGA driver.
This topic is intended for OEMs who want to build a Windows 10 system with USB Type-C connector and want to leverage OS features that allow for faster charging, power delivery, dual role, alternate modes, and error notifications through Billboard devices.
A traditional USB connection uses a cable with a USB A and USB B connector on each end. The USB A connector always plugs in to the host side and the USB B connector connects the function side, which is a device (phone) or peripheral (mouse, keyboard). By using those connectors, you can only connect a host to a function; never a host to another host or a function to another function. The host is the power source provider and the function consumes power from the host.
The traditional configuration limits some scenarios. For example, if a mobile device wants to connect to a peripheral, the device must act as the host and deliver power to the connected device.
The USB Type-C connector, introduced by the USB-IF, defined in the USB 3.1 specification, addresses those limitations. Windows 10 introduces native support for those features.
Feature summary
- Allows for faster charging up to 100W with Power Delivery over USB Type-C.
- Single connector for both USB Hosts and USB Devices.
- Can switch USB roles to support a USB host or device.
- Can switch power roles between sourcing and sinking power.
- Supports other protocols like DisplayPort and Thunderbolt over USB Type-C.
- Introduces USB Billboard device class to provide error notifications for Alternate Modes.
Official specifications
Hardware design
USB Type-C connector is reversible and symmetric.
The main component are: the USB Type-C connector and its port or PD controller that manages the CC pin logic for the connector. Such systems typically have a dual-role controller that can swap the USB role from host to function. It has Display-Out module that allows video signal to be transmitted over USB. Optionally it can support BC1.2 charger detection.
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Consider recommendations for the design and development of USB components, including minimum hardware requirements, Windows Hardware Compatibility Program requirements, and other recommendations that build on those requirements.Hardware component guidelines USB
Choose a driver model
Use this flow chart to determine a solution for your USB Type-C system.
| If your system... | Recommended solution... |
|---|---|
| Does not implement PD state machines | Write a client driver to the UcmTcpciCx class extension. Write a USB Type-C port controller driver |
| Implements PD state machines in hardware or firmware and support USB Type-C Connector System Software Interface (UCSI) over ACPI | Load the Microsoft provided in-box drivers, UcmUcsiCx.sys and UcmUcsiAcpiClient.sys. See UCSI driver. |
| Implements PD state machines in hardware or firmware, but either does not support UCSI, or support UCSI but requires a transport other than ACPI | Write a client driver for the UcmCx class extension. Write a USB Type-C connector driver Write a USB Type-C Policy Manager client driver |
| Implements UCSI but requires a transport other than ACPI | Write a client driver to the UcmUcsiCx class extension. Use this sample template and modify it based on a transport that your hardware uses. Write a UCSI client driver |
Bring up drivers
USB Function driver bring-up is only required if you support USB Function mode. If you previously implemented a USB Function driver for a USB micro-B connector, describe the appropriate connectors as USB Type-C in the ACPI tables for the USB Function driver to continue working.
For more information, see instructions about writing a USB Function driver.
USB Role-Switch driver bring-up is only required for devices that have a Dual Role controller that assumes both Host and Function roles. To bring-up the USB Role-Switch driver, you need to modify the ACPI tables to enable the Microsoft in-box USB role-switch driver.
For more information, see the guidance for bringing up the USB Role Switch Driver.
A USB Connector Manager Driver is required for Windows to manage the USB Type-C ports on a system. The bring-up tasks for a USB Connector Manager driver depend on the driver that you choose for the USB Type-C ports: The Microsoft in-box UCSI (UcmUcsiCx.sys and UcmUcsiAcpiClient.sys) driver, a UcmCx client driver, or a UcmTcpciCx client driver. For more information, see the links in the preceding section that describe how to choose the right solution for your USB Type-C system.
Test
Perform various functional and stress tests on systems and devices that expose a USB Type-C connector.
Test USB Type-C systems with USB Type-C ConnEx - Run USB tests included in the Windows Hardware Lab Kit (HLK) for Windows 10.
Run USB function HLK tests with a C-to-A cable (search for Windows USB Device in the HLK
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Certification/ComplianceAttend Power Delivery and USB Type-C compliance workshops hosted by the standards bodies.
See also