After all software fixes, some CX31993 dongles are simply defective due to:
Some, but not all, CX31993 implementations allow for firmware updates. This can fix issues with how the device interacts with the 3.5mm jack (detection issues) or mic controls. Cx31993 Datasheet Fix
If your hardware wiring matches the optimized datasheet specifications but you still experience quirks, the issue likely stems from the host operating system or internal firmware limits. After all software fixes, some CX31993 dongles are
: The official CX31993 datasheet outlines a clear procedure for initializing the chip: After all software fixes