There is a Linux driver for Mytek Stereo 192 DSD USB 2.0 function, as we have it in our Lumin U1 (Mini) products and we have customers using this combo. However, the old driver or the hardware it based on is not quite perfect for today’s generally accepted Linux requirements, there are quirks and some workarounds necessary. In our implementation it can only be detected at boot time.
Even with this driver the maxmium rate for Linux playback is still DSD64. DSD128 cannot be done using it due to DoP requirements.
A customer told me he found using the AES input to sound better than the USB 2.0 input.