kernel-packages team mailing list archive

["Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>]

Thomas Meyssonnier, given that it went from not working at all, to it's
working in a non-preferred way, it would seem helpful to identify this
commit (and in turn the committer) in order to advise them on how it's
improved but may need more work by them. Hence, the next step is to
fully reverse commit bisect from kernel 3.13 to 3.18 in order to
identify the last bad commit, followed immediately by the first good
one. Once this commit has been identified, then it may be reviewed as a
candidate for backporting into your release. Could you please do this
following
https://wiki.ubuntu.com/Kernel/KernelBisection#How_do_I_reverse_bisect_the_upstream_kernel.3F
?  Please note, finding adjacent kernel versions is not fully commit
bisecting.

Thank you for your understanding.

Helpful bug reporting tips:
https://wiki.ubuntu.com/ReportingBugs

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

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https://bugs.launchpad.net/bugs/1402196

Title:
  Behringer UMC404 USB2 audio interface disconnects when initialized

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  My audio interface, a Behriger UMC404, disappears from both lsusb and
  /proc/asound/cards as soon as I start jackd (JACK 2). This results in
  jackd failing because the card is missing. It reports a "protocol
  error" which I think refers to the USB link. See attached syslog
  messages. The card does not show up at all in Pulseaudio. Also, this
  card works just fine on my desktop, the bug only occurs on my laptop.

  Thanks,
  TM

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-lowlatency 3.13.0.43.50
  ProcVersionSignature: Ubuntu 3.13.0-43.72-lowlatency 3.13.11.11
  Uname: Linux 3.13.0-43-lowlatency x86_64
  ApportVersion: 2.14.1-0ubuntu3.6
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  tmeysson   3178 F.... pulseaudio
   /dev/snd/controlC0:  tmeysson   3178 F.... pulseaudio
  CurrentDesktop: XFCE
  Date: Sat Dec 13 14:39:46 2014
  HibernationDevice: RESUME=UUID=be114ffc-be9c-47e3-b2b6-7f49c90f9931
  InstallationDate: Installed on 2014-12-03 (10 days ago)
  InstallationMedia: Ubuntu-Studio 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.1)
  MachineType: Hewlett-Packard HP EliteBook 840 G1
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-43-lowlatency root=UUID=20e973d8-558f-476d-9979-54c79133177e ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-43-lowlatency N/A
   linux-backports-modules-3.13.0-43-lowlatency  N/A
   linux-firmware                                1.127.10
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 09/03/2014
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: L71 Ver. 01.21
  dmi.board.name: 198F
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: KBC Version 15.55
  dmi.chassis.asset.tag: 5CG446445Q
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: dmi:bvnHewlett-Packard:bvrL71Ver.01.21:bd09/03/2014:svnHewlett-Packard:pnHPEliteBook840G1:pvrA3008CD10003:rvnHewlett-Packard:rn198F:rvrKBCVersion15.55:cvnHewlett-Packard:ct10:cvr:
  dmi.product.name: HP EliteBook 840 G1
  dmi.product.version: A3008CD10003
  dmi.sys.vendor: Hewlett-Packard

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