kernel-packages team mailing list archive

[Jamie Strandboge <jamie@xxxxxxxxxx>]

This was all prompted by me thinking there was a bug in
lightdm/screenlocking since I was sometimes unable to
suspend/resume/unlock. I'm going to attach my test matrix procedure for
how I discovered the traceback and proved to myself that the traceback
is the most likely cause of my failure to unlock after suspend/resume. I
don't think this is needed for testing the kernel bug, but I will likely
run through it once there is a fix.

** Attachment added: "test matrix"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1295646/+attachment/4035757/+files/lp1295646.tar.gz

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https://bugs.launchpad.net/bugs/1295646

Title:
  Traceback when unplugging USB port replicator

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  I have a lenovo USB 2.0 port replicator with Digtial Video (MODEL
  #VDK8736). I discovered that whenever I unplugged my port replicator,
  there would be a kernel traceback. My laptop has a VGA port which I
  plug an external monitor into, and I use the port replicator for
  network, keyboard, mouse, and sound (ie, I don't use the digital video
  on the port replicator). This configuration works fine until I unplug
  the port replicator and I get a traceback (see attached logs). The
  system is mostly usable in this state, though it can cause problems
  later with suspend/resume/unlock where the screensaver sometimes can't
  receive input. I can still trigger the traceback if I only use the
  port replicator without using an external monitor.

  Booting into the linux-image-3.12.0-2-generic (3.12.0-2.7), I don't
  get a traceback when unplugging the port replicator.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-18-generic 3.13.0-18.38
  ProcVersionSignature: Ubuntu 3.13.0-18.38-generic 3.13.6
  Uname: Linux 3.13.0-18-generic x86_64
  ApportVersion: 2.13.3-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  jamie      2869 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Fri Mar 21 07:03:38 2014
  HibernationDevice: RESUME=UUID=c4c5dbc0-d41a-428d-8af4-b680b67dd3dc
  InstallationDate: Installed on 2011-06-28 (996 days ago)
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110425.2)
  Lsusb:
   Bus 002 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
   Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 001 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: LENOVO 5129CTO
  ProcFB:
   0 inteldrmfb
   1 udldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-18-generic root=UUID=88689ad2-74b5-442c-9290-8ae60b63e16b ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-18-generic N/A
   linux-backports-modules-3.13.0-18-generic  N/A
   linux-firmware                             1.126
  RfKill:
   0: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no
  SourcePackage: linux
  UpgradeStatus: Upgraded to trusty on 2013-11-04 (136 days ago)
  dmi.bios.date: 02/24/2011
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 6QET64WW (1.34 )
  dmi.board.name: 5129CTO
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvr6QET64WW(1.34):bd02/24/2011:svnLENOVO:pn5129CTO:pvrThinkPadX201s:rvnLENOVO:rn5129CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 5129CTO
  dmi.product.version: ThinkPad X201s
  dmi.sys.vendor: LENOVO

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