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[Launchpad Bug Tracker <1537465@xxxxxxxxxxxxxxxxxx>]

[Expired for linux (Ubuntu) because there has been no activity for 60
days.]

** Changed in: linux (Ubuntu)
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1537465

Title:
  Idle too much time when loading snd-usb-audio.ko

Status in linux package in Ubuntu:
  Expired

Bug description:
  I'm using Ubuntu 16.04 amd64 Desktop, with kernel 4.3. And my USB
  Video Camera is from Gsou, containing both camera device and
  microphone device.

  When booting Ubuntu, after login ubuntu session, system freeze for
  around 40 seconds !!

  Finnally I found out that its "snd-usb-audio.ko" that makes it too
  slow when login. So I added "blacklist snd-usb-audio" into
  /etc/modprobe.d/blacklist.list, then everything is okay, login step
  works normally.

  After login desktop, I opened a terminal and execute "sudo modprobe
  snd-usb-audio" to load microphone device manually, then it's still
  very slow to load --

  ===============
  ghostplant@ghostplant:~$ sudo modprobe snd-usb-audio

  real	0m41.301s
  user	0m0.540s
  sys	0m2.912s
  ===========

  After waiting 40s to load snd-usb-audio, "dmesg | mesg" displays a new
  message:

  [  806.057680] usbcore: registered new interface driver snd-usb-audio

  So, I think there is a bug containning inside snd-usb-audio.ko,
  because it's not supposed to cost so much time.

  Note:

  In gnome-session, snd-usb-audio makes login step very slow like to be
  freeze:

  Click Login (<1s) =>
  gnome-session loading components (compiz, unity-settings-daemon, .. # some required reading data from snd-hda-audio, >40s)
  Show Desktop (<1s)

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-extra-4.3.0-7-generic 4.3.0-7.18
  ProcVersionSignature: Ubuntu 4.3.0-7.18-generic 4.3.3
  Uname: Linux 4.3.0-7-generic x86_64
  AlsaVersion: Advanced Linux Sound Architecture Driver Version k4.3.0-7-generic.
  ApportVersion: 2.19.3-0ubuntu3
  Architecture: amd64
  CurrentDesktop: GNOME-Flashback
  Date: Sun Jan 24 17:03:43 2016
  MachineType: Gigabyte Technology Co., Ltd. To be filled by O.E.M.
  PciMultimedia:

  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.3.0-7-generic root=UUID=5cc5f01f-1440-4404-a8a1-db62012f312e ro quiet cgroup_enable=memory swapaccount=1
  RelatedPackageVersions:
   linux-restricted-modules-4.3.0-7-generic N/A
   linux-backports-modules-4.3.0-7-generic  N/A
   linux-firmware                           1.155
  RfKill:

  SourcePackage: linux
  StagingDrivers: r8188eu
  UpgradeStatus: No upgrade log present (probably fresh install)
  WifiSyslog:

  dmi.bios.date: 03/23/2012
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: F5
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: H61M-S1
  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.:bvrF5:bd03/23/2012:svnGigabyteTechnologyCo.,Ltd.:pnTobefilledbyO.E.M.:pvrTobefilledbyO.E.M.:rvnGigabyteTechnologyCo.,Ltd.:rnH61M-S1: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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