Same here.

TEAC AI-101 Dac/Amp connecting to Linux Mint 17.3 Rosa \n \l - 64 bit
VERSION="14.04.4 LTS, Trusty Tahr"

3.19.0-32-generic #37~14.04.1-Ubuntu SMP Thu Oct 22 09:41:40 UTC 2015
x86_64 x86_64 x86_64 GNU/Linux

On connecting the Teac to USB 2, the device turns up in the sound
control window properly, and I can select it, but when I try to send
audio to it, nothing comes out and the applications stall. They don't
report anything, they just hang until I select a different sound output
and then they continue as if nothing happened... but on selecting the
Teac, nothing wants to move.

On connecting the Teac to USB 3, it seems to connect and disconnect.
Doesn't even flicker a presence in the sound window.

I did try to connect via Bluetooth as well, but it wouldn't connect for
some reason. Sees it, pairs with it, trusts it, but doesn't want to use
it as a device. At that point, I ran out of time.

USB2....
[612629.199542] usb 5-2.4.2: new high-speed USB device number 18 using ehci-pci
[612629.915629] usb 5-2.4.2: new high-speed USB device number 19 using ehci-pci
[612630.009199] usb 5-2.4.2: New USB device found, idVendor=0644, idProduct=8051
[612630.009208] usb 5-2.4.2: New USB device strings: Mfr=1, Product=2, 
SerialNumber=3
[612630.009213] usb 5-2.4.2: Product: TEAC AI-101 Audio
[612630.009217] usb 5-2.4.2: Manufacturer: TEAC
[612630.009221] usb 5-2.4.2: SerialNumber: ACEGIKMOQS....

USB3....
[613059.985196] usb 1-1: new high-speed USB device number 12 using xhci_hcd
[613060.118318] usb 1-1: New USB device found, idVendor=0644, idProduct=8051
[613060.118325] usb 1-1: New USB device strings: Mfr=1, Product=2, 
SerialNumber=3
[613060.118329] usb 1-1: Product: TEAC AI-101 Audio
[613060.118332] usb 1-1: Manufacturer: TEAC
[613060.118335] usb 1-1: SerialNumber: ACEGIKMOQS....
[613102.527644] usb 1-1: USB disconnect, device number 12

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https://bugs.launchpad.net/bugs/1580444

Title:
  Can't plug in USB audio device "TEAC AI-101 Audio"

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