如果确定系统没有问题（识别其他的设备为USB3）时，可参考如下解决方案，来自https://www.intel.com/content/www/us/en/support/articles/000027498/emerging-technologies/intel-realsense-technology.html

What are you seeing? The RealSense Viewer or other tool is reporting that the D400 camera is connected to a USB 2.0 port but the camera is actually connected to a USB 3.0. Video appears corrupted.

Environment: D400 series camera is connected to USB 3 port. How to fix it: Possible workarounds:

Unplug the camera and plug it back in quickly.

Connect the cable to the camera side first then to the host second.

Reverse the orientation of the C-type connector to the camera.

Plug in the camera to other PCs with USB 3 ports and plug it back into the original PC.

There is a hardware issue with the type-C connector on the camera module that may be causing the problem. There is a controller on the board that switches a MUX to route the SS signals from the connector to the ASIC and it is slow to switch; the USB2 signals always connect first and if the ASIC doesn’t see the USB3 signals soon enough, it starts in USB2 mode.

The RealSense D400 series cameras will function when recognized as USB 2 and also when connected to USB 2 ports. There is limited support for USB 2. See the RealSense D400 Spec Update for more details.