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[".m." <mulisak@xxxxxxxxxxx>]

bug confirmed with picuntu( ubuntu 1204 ) on ARM rk3188 usb2 kernel 3.0.36+ and webcam a4 tech pk-910h.
Although "kamoso" shows loads of errors like this
libv4l2: error dequeuing buf: Success
picture is displayed even through ssh -X root@picuntu

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https://bugs.launchpad.net/bugs/1335040

Title:
  USB 3.0 cameras dont work properly after upgrading to 3.2.0-64 kernel.

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  After doing a kernel upgrade on my Ubuntu 12.04 LTS system from
  3.2.0-63 to 3.2.0-64, USB 3.0 cameras have stopped working properly. I
  use the application guvcview to preview the cameras. The initial
  preview when starting the application works fine. But when trying to
  change the resolution of preview, the application reports an error
  continuously for each frame.

  Description:	Ubuntu 12.04.4 LTS
  Release:	12.04

  guvcview:
    Installed: 1.5.3-0ubuntu1
    Candidate: 1.5.3-0ubuntu1
    Version table:
   *** 1.5.3-0ubuntu1 0
          500 http://archive.ubuntu.com/ubuntu/ precise/universe i386 Packages
          100 /var/lib/dpkg/status

  cat /proc/version_signature 
  Ubuntu 3.2.0-64.97-generic-pae 3.2.59

  Steps to reproduce:
  $ sudo apt-get update && sudo apt-get dist-upgrade && sudo apt-get install guvcview -y
  $ sync
  $ sudo reboot

  
  Connect any USB3.0 superspeed camera available on the market to an USB 3.0 port on your system.
  I am using an e-con system's See3CAM_80 USB 3.0 camera.

  
  Now start the application guvcview from a terminal window 
  $ guvcview

  The application starts up showing the GUI for controls and another
  window showing the preview. Now try to change the resolution of the
  camera by using the "resolution" combo box present in Video tab of the
  application controls window.

  What I expected to happen :
  The preview resolution should have changed to the selected resolution.

  What happened instead :
  The preview window becomes black and no more frames are obtained from the camera. The terminal window shows the following errors repeatedly.
  libv4l2: error dequeuing buf: Input/output error
  VIDIOC_DQBUF - Unable to dequeue buffer : Input/output error
  Error grabbing image 
  libv4l2: error dequeuing buf: Input/output error
  VIDIOC_DQBUF - Unable to dequeue buffer : Input/output error
  Error grabbing image 
  libv4l2: error dequeuing buf: Input/output error
  VIDIOC_DQBUF - Unable to dequeue buffer : Input/output error
  Error grabbing image 
  libv4l2: error dequeuing buf: Input/output error
  VIDIOC_DQBUF - Unable to dequeue buffer : Input/output error
  Error grabbing image 
  libv4l2: error dequeuing buf: Invalid argument
  VIDIOC_DQBUF - Unable to dequeue buffer : Invalid argument
  Error grabbing image 
  libv4l2: error dequeuing buf: Invalid argument
  VIDIOC_DQBUF - Unable to dequeue buffer : Invalid argument
  Error grabbing image 
  libv4l2: error dequeuing buf: Invalid argument
  VIDIOC_DQBUF - Unable to dequeue buffer : Invalid argument
  Error grabbing image 
  libv4l2: error dequeuing buf: Invalid argument
  VIDIOC_DQBUF - Unable to dequeue buffer : Invalid argument
  Error grabbing image 
  libv4l2: error dequeuing buf: Invalid argument
  VIDIOC_DQBUF - Unable to dequeue buffer : Invalid argument
  Error grabbing image 
  libv4l2: error dequeuing buf: Invalid argument
  VIDIOC_DQBUF - Unable to dequeue buffer : Invalid argument
  Error grabbing image 
  libv4l2: error dequeuing buf: Invalid argument
  VIDIOC_DQBUF - Unable to dequeue buffer : Invalid argument
  Error grabbing image 
  libv4l2: error dequeuing buf: Invalid argument
  VIDIOC_DQBUF - Unable to dequeue buffer : Invalid argument
  Error grabbing image 
  libv4l2: error dequeuing buf: Invalid argument
  VIDIOC_DQBUF - Unable to dequeue buffer : Invalid argument
  Error grabbing image 
  libv4l2: error dequeuing buf: Invalid argument
  VIDIOC_DQBUF - Unable to dequeue buffer : Invalid argument
  Error grabbing image 
  libv4l2: error dequeuing buf: Invalid argument
  VIDIOC_DQBUF - Unable to dequeue buffer : Invalid argument
  Error grabbing image 
  libv4l2: error dequeuing buf: Invalid argument
  VIDIOC_DQBUF - Unable to dequeue buffer : Invalid argument
  Error grabbing image 
  libv4l2: error dequeuing buf: Invalid argument
  VIDIOC_DQBUF - Unable to dequeue buffer : Invalid argument
  Error grabbing image 
  libv4l2: error dequeuing buf: Invalid argument
  VIDIOC_DQBUF - Unable to dequeue buffer : Invalid argument
  Error grabbing image 
  libv4l2: error dequeuing buf: Invalid argument
  VIDIOC_DQBUF - Unable to dequeue buffer : Invalid argument
  Error grabbing image 
  libv4l2: error dequeuing buf: Invalid argument
  VIDIOC_DQBUF - Unable to dequeue buffer : Invalid argument
  Error grabbing image 
  libv4l2: error dequeuing buf: Invalid argument
  VIDIOC_DQBUF - Unable to dequeue buffer : Invalid argument
  Error grabbing image 
  libv4l2: error dequeuing buf: Invalid argument
  VIDIOC_DQBUF - Unable to dequeue buffer : Invalid argument
  Error grabbing image 
  libv4l2: error dequeuing buf: Invalid argument
  VIDIOC_DQBUF - Unable to dequeue buffer : Invalid argument
  Error grabbing image 
  libv4l2: error dequeuing buf: Invalid argument
  VIDIOC_DQBUF - Unable to dequeue buffer : Invalid argument
  Error grabbing image 
  libv4l2: error dequeuing buf: Invalid argument
  VIDIOC_DQBUF - Unable to dequeue buffer : Invalid argument
  Error grabbing image 
  libv4l2: error dequeuing buf: Invalid argument
  VIDIOC_DQBUF - Unable to dequeue buffer : Invalid argument
  Error grabbing image 
   and so on...

  
  Restarting the application also doesnt work. Only after disconnecting and reconnecting the camera, I am able to see the preview properly. 

  The workaround is to revert to kernel 3.2.0-63. After that the
  application is working fine and switching to other resolutions also
  work properly.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-image-3.2.0-64-generic-pae 3.2.0-64.97
  ProcVersionSignature: Ubuntu 3.2.0-64.97-generic-pae 3.2.59
  Uname: Linux 3.2.0-64-generic-pae i686
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 2.0.1-0ubuntu17.6
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  dilip_kumar   2171 F.... pulseaudio
  Card0.Amixer.info:
   Card hw:0 'PCH'/'HDA Intel PCH at 0xf7d10000 irq 46'
     Mixer name	: 'Intel PantherPoint HDMI'
     Components	: 'HDA:10ec0662,10280576,00100300 HDA:80862806,10280576,00100000'
     Controls      : 42
     Simple ctrls  : 21
  Date: Fri Jun 27 13:20:45 2014
  HibernationDevice: RESUME=UUID=34d66c70-81e6-4651-aa2a-8d45e4f4d372
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release i386 (20120423)
  MachineType: Dell Inc. Vostro 270s
  MarkForUpload: True
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.2.0-64-generic-pae root=UUID=62503b1b-36fc-4afd-b26a-3981934e72a2 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.2.0-64-generic-pae N/A
   linux-backports-modules-3.2.0-64-generic-pae  N/A
   linux-firmware                                1.79.16
  RfKill:
   0: phy0: Wireless LAN
   	Soft blocked: yes
   	Hard blocked: no
  SourcePackage: linux
  StagingDrivers: mei
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 10/14/2013
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A11
  dmi.board.name: 0XFWHV
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 3
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA11:bd10/14/2013:svnDellInc.:pnVostro270s:pvr:rvnDellInc.:rn0XFWHV:rvrA00:cvnDellInc.:ct3:cvr:
  dmi.product.name: Vostro 270s
  dmi.sys.vendor: Dell Inc.

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