It’s an old audio card. The output and input work, but it retains the volume level and mix settings as last adjusted in Windows. I’ll replace it eventually with a DAC and amp, which is what we put together for my wife’s build last year.
It’s the nuAudio card (non-pro version) from EVGA. There are a few work around a, one of which is backflashing old firmware to get some level of control in Linux, but I don’t like the tradeoff and a couple of my Elite: Dangerous tools don’t work well on Linux anyway, so I need the Windows install for that.