Phonic Helix Board 12 Universal: Recording is silent

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Hey,

I've got a Phonic Helix Board 12 Universal USB/FireWire Mixer (combination of analog mixer + multitrack soundcard). After performing a firmware upgrade, the kernel happily loads the USB Audio Class 2.0 interface driver for it. I can select it for recording in Ardour, but all recordings are completely silent (playback works perfectly fine). Since the device also has a FireWire port, I tried the FireWire connection: Recordings work flawlessly. I'm using ALSA drivers from Linux 4.17.3.

Does anybody have experience with this device or similar behavior?

I reported this as a kernel bug some time ago at https://bugzilla.kernel.org/show_bug.cgi?id=199791 where you can also find lsusb output and information from /proc/asound/card2/stream0. If needed, I can also provide Wireshark traces from Windows (=working) and Linux (=recording silent).

Thank You,

Andreas


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