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[Christopher Barrington-Leigh <cpblpublic@xxxxxxxxx>]

No change after BIOS update.  (which seemed only a security release; not
sure why you suspected that.)

 sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date
GCETA1WW (2.61 )
02/12/2015

I can't reproduce what happened in the past in more detail. 
Here's what happens now:

After unplugging the external USB camera which I've now attached,
running cheese gives stderr (/stdout):

$ cheese
libv4l2: error setting pixformat: Device or resource busy
libv4l2: error setting pixformat: Device or resource busy

(cheese:15898): cheese-WARNING **: Device '/dev/video1' is busy: gstv4l2object.c(2838): gst_v4l2_object_set_format (): /GstCameraBin:camerabin/GstWrapperCameraBinSrc:camera_source/GstBin:bin18/GstV4l2Src:video_source:
Call to S_FMT failed for YU12 @ 352x288: Device or resource busy


guvcview gives:

$ guvcview 
V4L2_CORE: ERROR opening V4L interface: No such file or directory


lsusb gives:

$ lsusb
Bus 004 Device 003: ID 056a:00e6 Wacom Co., Ltd 
Bus 004 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 004 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 005: ID 04f2:b2ea Chicony Electronics Co., Ltd Integrated Camera [ThinkPad]
... etc


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

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https://bugs.launchpad.net/bugs/1433298

Title:
  integrated web cam stopped working suddenly

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  I'm on a Lenovo X230T running Ubuntu 14.04 and I regularly video chat for work.
  2.5 weeks ago, my camera didn't come on during google chrome google video chat.
  It still worked when I ran cheese.
  Then, it stopped work under cheese, g-chat, or skype. It didn't work even when I booted into 14.10 or 15.04.

  Then, a week ago, after another update, it began working normally again.
  Yesterday, during a gchat , my video suddenly went off and now the integrated camera doesn't work again under guvcview or cheese or etc.  An external camera works.

  Once again, this problem is consistent across operating systems.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: linux-image-3.19.0-9-generic 3.19.0-9.9
  ProcVersionSignature: Ubuntu 3.19.0-9.9-generic 3.19.1
  Uname: Linux 3.19.0-9-generic x86_64
  ApportVersion: 2.16.2-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  cpbl       3458 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Tue Mar 17 16:24:59 2015
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2015-03-07 (9 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Alpha amd64 (20150306)
  MachineType: LENOVO 34372VU
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-9-generic root=UUID=6122b2f3-86a4-47d0-9e71-588428e86b7b ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.19.0-9-generic N/A
   linux-backports-modules-3.19.0-9-generic  N/A
   linux-firmware                            1.143
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 05/28/2014
  dmi.bios.vendor: LENOVO
  dmi.bios.version: GCET99WW (2.59 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 34372VU
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Defined
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvrGCET99WW(2.59):bd05/28/2014:svnLENOVO:pn34372VU:pvrThinkPadX230Tablet:rvnLENOVO:rn34372VU:rvrNotDefined:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 34372VU
  dmi.product.version: ThinkPad X230 Tablet
  dmi.sys.vendor: LENOVO

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