I noticed that my USB DAC - RME ADI-2 DAC FS - doesn’t work when it is connected to my Linux desktop or Macbook Pro (2020) when connected via the L1KVM USB2 ports. It does work when connected via the USB3 ports.
It works via USB3. If I disconnect/reconnect USB3 I get the following dmesg output:
[3291707.706657] usb 3-4.2: new high-speed USB device number 19 using xhci_hcd
[3291707.810920] usb 3-4.2: New USB device found, idVendor=2a39, idProduct=3fd3, bcdDevice= 0.01
[3291707.810922] usb 3-4.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[3291707.810923] usb 3-4.2: Product: ADI-2 DAC (59740212)
[3291707.810924] usb 3-4.2: Manufacturer: RME
[3291707.810925] usb 3-4.2: SerialNumber: [SNIP]
It does not work via USB2. If I disconnect/reconnect USB3 I get the following dmesg output:
[3291769.402514] usb 3-4.1.1: New USB device found, idVendor=2a39, idProduct=3fd3, bcdDevice= 0.01
[3291769.402516] usb 3-4.1.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[3291769.402518] usb 3-4.1.1: Product: ADI-2 DAC (59740212)
[3291769.402519] usb 3-4.1.1: Manufacturer: RME
[3291769.402521] usb 3-4.1.1: SerialNumber: [SNIP]
[3291769.465580] usb 3-4.1.1: parse_audio_format_rates_v2v3(): unable to retrieve number of sample rates (clock 1)
[3291769.465971] usb 3-4.1.1: parse_audio_format_rates_v2v3(): unable to retrieve number of sample rates (clock 1)
Not a big deal. I’m just wondering if this is a known or expected issue; and if not, is there any chance of a firmware fix?