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[Danilo Siqueira <danilo.bs@xxxxxxxxx>]

I have a usb audio device that i was using regularly and suddenly
stopped being recognized. The system can't even identify its ID's
anymore (ID ffff:fffe).

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https://bugs.launchpad.net/bugs/1227149

Title:
  USB audio sound card not recognized after update to Linux
  3.12-rc1-saucy

Status in alsa-driver package in Ubuntu:
  Confirmed

Bug description:
  Not sure where this report should go, I think it concerns the Linux
  kernel 3.12-rc1-saucy from http://kernel.ubuntu.com/~kernel-
  ppa/mainline/

  After installing above mentioned kernel (switching from 3.11.1) I can
  no longer use my USB sound card. (It is an external D/A converter and
  speaker amplifier.) The sound settings dialog only lists "Dummy
  Output". (My onboard soundcard is disabled in BIOS.)

  Dmesg:
  usb 1-1.1.2: new full-speed USB device number 13 using ehci-pci
  usb 1-1.1.2: New USB device found, idVendor=08bb, idProduct=2706
  usb 1-1.1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
  usb 1-1.1.2: Product: USB Audio DAC   
  usb 1-1.1.2: Manufacturer: Burr-Brown from TI              
  input: Burr-Brown from TI               USB Audio DAC    as /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.1/1-1.1.2/1-1.1.2:1.2/input/input9
  hid-generic 0003:08BB:2706.0007: input,hidraw4: USB HID v1.00 Device [Burr-Brown from TI               USB Audio DAC   ] on usb-0000:00:1a.0-1.1.2/input2
  snd_usb_audio: `-2' invalid for parameter `index'

  and /etc/modprobe.d/alsa-base.conf indeed does have this line:
  options snd-usb-audio index=-2

  The kernel apparently sees my USB amplifier, but it is not listed in
  the Sound settings, even though there is no other sound device
  present.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu4
  Uname: Linux 3.12.0-031200rc1-generic x86_64
  ApportVersion: 2.9.2-0ubuntu8.3
  Architecture: amd64
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  Date: Wed Sep 18 15:14:53 2013
  InstallationDate: Installed on 2012-11-02 (319 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
  MarkForUpload: True
  PackageArchitecture: all
  SourcePackage: alsa-driver
  Symptom: audio
  Title: USB sound card not detected
  UpgradeStatus: Upgraded to raring on 2013-09-01 (16 days ago)
  dmi.bios.date: 08/22/2012
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: F14
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: Z77X-UD5H
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.board.version: x.x
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrF14:bd08/22/2012:svnGigabyteTechnologyCo.,Ltd.:pnTobefilledbyO.E.M.:pvrTobefilledbyO.E.M.:rvnGigabyteTechnologyCo.,Ltd.:rnZ77X-UD5H:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: To be filled by O.E.M.
  dmi.product.version: To be filled by O.E.M.
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.

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