Provide an INF file that specifies the Ports device setup class and the Serial function driver as the service for the port. To configure a serial port as COM port, comply with the requirements that are defined in Configuration of COM Ports. Mar 31, 2020 Plug the power cable back to the device and turn on your PC. Now, you can try connecting the monitor via the DisplayPort interface and check if the issue is resolved or not. Update the Device Driver. If the graphics card driver on your computer is not the latest build, you may also counter the display port no signal issue.

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Summary :

The ASUS ROG Crosshair VIII Hero is worthwhile primarily for users who are looking for a particularly chic motherboard, water cooling, benefit from the fast 2.5Gbit LAN port and / or use expensive headphones. Here the 400€ for the ROG Hero can be worth it! The ASUS ROG Crosshair VIII Hero is worthwhile primarily for users who are looking for a particularly chic motherboard, water cooling, benefit from the fast 2.5Gbit LAN port and / or use expensive headphones. Here the 400€ for the ROG Hero can be worth it! Mar 25, 2016 Unknown USB Device usually means that there are no proper drivers especially for the motherboard. Therefore, I suggest to visit the manufacture website and install the latest chipset. Suggest to uninstall ASUS Xonar U7 driver and reinstall the latest from this link.

Have you come across the DisplayPort no signal issue? This problem often occurs when connecting ASUS monitor via DisplayPort. What causes DisplayPort not detected? How to fix this vexing problem? Now, try these top 5 troubleshooting methods of MiniTool.

What Causes the DisplayPort No Signal Issue

DisplayPort is a digital display interface that can connect your devices to a monitor for better performance. Besides, it can be used to carry different types of data such as audio, video, and USB. However, a great number of users are bothered by the DisplayPort no signal issue when using ASUS monitor.

What causes the DisplayPort no signal ASUS problem? According to the user reports, here are several common causes behind the error:

• Broken display port: If the DisplayPort is broken or loose, there may be no dp signal from your device.
• Outdated or missing device drivers: It is another common reason for DisplayPort no signal Windows 10. You should try updating to the latest device driver.
• Inappropriate refresh rate: It is a software issue that may lead to the DisplayPort not detected issue as well.

Now, you may have an overall understanding of the possible causes. To troubleshoot this problem, the following 5 accessible methods are explored. You can try them one by one until you fixed the issue.

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Fix 1. Redstart and Reconnect the Devices

The simplest and fastest method to fix the display port no signal issue is to restart and reconnect your device. Here’s how to do that:

Step 1. Turn your computer off entirely.

Step 2. Disconnect all monitors and the power cables from your computer.

Step 3. Unplug the DisplayPort connection and wait for a couple of minutes.

Step 4. Reconnect the monitor that you encounter the DisplayPort monitor not detected issue to the computer.

Step 5. Plug the power cable back to the device and turn on your PC.

Now, you can try connecting the monitor via the DisplayPort interface and check if the issue is resolved or not.

Fix 2. Update the Device Driver

If the graphics card driver on your computer is not the latest build, you may also counter the display port no signal issue. You can fix it by updating the device driver to the latest version. For that:

Step 1. Right-click the Start menu and select the Device Manager option from the context menu.

Step 2. Expand the Display adapters category, and then right-click the device driver that you want to update and select the Update driver from the context menu.

Step 3. In the pop-up window, click on the Search automatically for updated driver software option to start installing the latest graphics card driver. After that, you can follow the on-screen prompts to complete this installation.

Fix 3. Change the Refresh Rate on the Monitor

As pointed out on the above, the appropriate refresh rate is also responsible for the DisplayPort no signal ASUS issue. Changing the refresh rate on your monitor has been proved by some users to be useful. So, it’s worth having a try.

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Fix 4. Check Your DisplayPort Connection

If the DisplayPort connector is plugged into the port improperly or loosely, you will encounter this annoying problem. So, please make ensure that the connector has been plugged into the port properly and don’t plug it out too frequently.

You can check if the DisplayPort is connected properly by unplugging and re-plugging it. Then further pushing the connector until the pointy bits are locked on the plug firmly so that you can’t pull it out easily.

Fix 5. Switch to Another Cable or Device

Apart from the software issues, the hardware issue can also lead to the “no dp signal from your device” issue. If all the above methods fail to work, you may consider switching to another cable and device. You can test the DisplayPort connection on another DisplayPort cable or on another computer and monitor.

If the DisplayPort no signal error also occurs on another device or cable, it indicates that your DisplayPort connector may suffer from some hardware issues. You can ask for assistance from the manufacturer within the warranty period.

Important

This topic is for programmers. If you are a customer experiencing USB problems, see Troubleshoot common USB problems

This topic lists the Microsoft-provided drivers for the supported USB device classes.

• Microsoft-provided drivers for USB-IF approved device classes.
• For composite devices, use USB Generic Parent Driver (Usbccgp.sys) that creates physical device objects (PDOs) for each function.
• For non-composite devices or a function of a composite device, use WinUSB (Winusb.sys).

If you are installing USB drivers: You do not need to download USB device class drivers. They are installed automatically. These drivers and their installation files are included in Windows. They are available in the WindowsSystem32DriverStoreFileRepository folder. The drivers are updated through Windows Update.

If you are writing a custom driver: Before writing a driver for your USB device, determine whether a Microsoft-provided driver meets the device requirements. If a Microsoft-provided driver is not available for the USB device class to which your device belongs, then consider using generic drivers, Winusb.sys or Usbccgp.sys. Write a driver only when necessary. More guidelines are included in Choosing a driver model for developing a USB client driver.

USB Device classes

USB Device classes are categories of devices with similar characteristics and that perform common functions. Those classes and their specifications are defined by the USB-IF. Each device class is identified by USB-IF approved class, subclass, and protocol codes, all of which are provided by the IHV in device descriptors in the firmware. Microsoft provides in-box drivers for several of those device classes, called USB device class drivers. If a device that belongs to a supported device class is connected to a system, Windows automatically loads the class driver, and the device functions with no additional driver required.

Hardware vendors should not write drivers for the supported device classes. Windows class drivers might not support all of the features that are described in a class specification. If some of the device's capabilities are not implemented by the class driver, vendors should provide supplementary drivers that work in conjunction with the class driver to support the entire range of functionality provided by the device.

For general information about USB-IF approved device classes see the USB Common Class Specification

The current list of USB class specifications and class codes is documented in the USB-IF Defined Class Code List.

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Device setup classes

Windows categorizes devices by device setup classes, which indicate the functionality of the device.

Microsoft defines setup classes for most devices. IHVs and OEMs can define new device setup classes, but only if none of the existing classes apply. For more information, see System-Defined Device Setup Classes.

Two important device setup classes for USB devices are as follows:

• USBDevice {88BAE032-5A81-49f0-BC3D-A4FF138216D6}: IHVs must use this class for custom devices that do not belong to another class. This class is not used for USB host controllers and hubs.

• USB {36fc9e60-c465-11cf-8056-444553540000}: IHVs must not use this class for their custom devices. This is reserved for USB host controllers and USB hubs.

The device setup classes are different from USB device classes discussed earlier. For example, an audio device has a USB device class code of 01h in its descriptor. When connected to a system, Windows loads the Microsoft-provided class driver, Usbaudio.sys. In Device Manager, the device is shown under is Sound, video and game controllers, which indicates that the device setup class is Media.

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Microsoft-provided USB device class drivers

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