Daniel Mack: > BTW, just out of curiosity: did you ever try to connect these two cards to a Windows machine? At least years ago, Microsoft's insanely ugly-smelling low-level USB stack would completely freak out for two identical devices with no serial number. No, I don't have access to a windows machine, so I couldn't test it. Tanu Kaskinen: Thanks for the fix. I've been a bit busy lately, so haven't had the time to look too closely into it. But I cloned your git repo and tried to run it. The alsa-module did load nicely, however, it seemed to be a similar issue when creating the sink: ---- Aug 29 22:27:06 willpower pulseaudio[32123]: sink.c: Failed to register name alsa_output.usb-BeAutiful_Qing_Audioengine_AW1-00.analog-stereo. Aug 29 22:27:06 willpower pulseaudio[32123]: alsa-sink.c: Failed to create sink object Aug 29 22:27:06 willpower pulseaudio[32123]: module.c: Loaded "module-alsa-card" (index: #2; argument: "device_id="2" name="usb-BeAutiful_Qing_Audioengine_AW1-00" card_name="alsa_card.usb-BeAutiful_Qing_Audioengine_AW1-00" namereg_fail=false tsched=yes ignore_dB=no card_properties="module-udev-detect.discovered=1""). ---- When issuing 'pactl list' I could find the other cards with their sinks/sources, and I also found the second card correctly named 'alsa_card.usb-BeAutiful_Qing_Audioengine_AW1-00.2', but no sinks connected to it. Quickly looking into the source, the failing log-output comes from pulsecore/card.c:185 as it hits the if-test: if (!(name = pa_namereg_register(core, data->name, PA_NAMEREG_SINK, s, data->namereg_fail))) { Unless you get ahead of me, I could try to see if I'm able to apply a similar approach as you did for loading the card itself. But as I said, I didn't have time to look too closely into it yet. -Ivar!