[alsa-devel] 18i20 2nd Gen no ALSA mixer

It was reported that Focusrite 18i20 Gen 2 seems not 100% compatible with the 18i20 Gen 1. It can work, but no ALSA Mixer support. What information does ALSA team need to get this fixed (USB Device ID) P.S: How to pull the ALSA driver code to to change it and test such fixon Ubuntu ? Any tutorial, step by step instruction ?