Video works perfectly, but sound still comes from your laptop speakers. Solution: The USB 3 to HDMI driver handles video, but audio requires a separate playback device. Go to Sound Settings > Output . Look for "DisplayLink Audio" or "USB Audio." Set that as your default device. If you don't see it, reinstall the driver and check the box for "HDMI Audio Support" during setup.
Because standard USB-A ports do not natively transmit video signals, they rely on specialized chipsets (like DisplayLink or Fresco Logic) and their corresponding drivers to compress and send video data. Why You Need a Dedicated Driver usb 3 to hdmi driver