Recently had some trouble connecting the TEAC AI-101DA USB DAC amplifier on Ubuntu 20.04. Although it seemed to work fine with older kernel versions, it seemed to not be recognised with kernel v5.4.0.
The kernel logs were not very useful, but did show at least that the device was recognised.
[ 54.448539] usb 5-4: new high-speed USB device number 4 using xhci_hcd
[ 54.828302] usb 5-4: Device not responding to setup address.
[ 55.036578] usb 5-4: Device not responding to setup address.
[ 55.244386] usb 5-4: device not accepting address 4, error -71
[ 55.580520] usb 5-4: new high-speed USB device number 5 using xhci_hcd
[ 55.602046] usb 5-4: New USB device found, idVendor=0644, idProduct=8051, bcdDevice= 0.17
[ 55.602053] usb 5-4: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 55.602057] usb 5-4: Product: TEAC AI-101 Audio[ 55.602060] usb 5-4: Manufacturer: TEAC
After a but of googling, it was solved by the following terminal commands:
echo Y | sudo tee /sys/module/usbcore/parameters/use_both_schemes
echo Y | sudo tee /sys/module/usbcore/parameters/old_scheme_first
