Comment # 7 on bug 1093485 from Takashi Iwai

Thanks.

Could you try to pass quirk_alias=047fc025:047f0ca1 to snd-usb-audio module?
e.g. create a file /etc/modprobe.d/50-usb-audio.conf containing the following
line:
  options snd-usb-audio quirk_alias=047fc025:047f0ca1