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[Leonid Kuzmin <1063658@xxxxxxxxxxxxxxxxxx>]

Rajib, thanks for help! It seems "Video Bus" isn't a fingerprint reader:
$ lsusb | grep Finger
Bus 002 Device 004: ID 138a:0011 Validity Sensors, Inc. VFS5011 Fingerprint Reader

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https://bugs.launchpad.net/bugs/1063658

Title:
  Unknown "Video Bus" device continuously generates keys combination

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  Issue starts at boot process and looks like repetitive generation "^@" symbol combination in console. In the graphical interface it causes windows and cursor flickering, but only after login screen (login screen is working well) and when switching to console (ctrl + alt + f1) I'm not able to login because all keyboard input is mixed with "^@" symbols. Experimentally I found that issue is caused by unknown device listed as "Video Bus" in xinput --list:
  $xinput --list --long
  ↳ Video Bus                               	id=8	[slave  keyboard (3)]
   This device is disabled
   Reporting 1 classes:
    Class originated from: 8. Type: XIKeyClass
    Keycodes supported: 248

  When device is disabled by following command:
  $xinput set-prop 8 "Device Enabled" 0

  Flickering of graphics stops, and after switching to console (ctrl + alt + f1) and back (ctrl + alt + f7) the device is enabled back.
  If second monitor is plugged flickering of windows stops and system starts to turn off and on both monitors with different resolutions.

  Here are all possible details of the "Video Bus" device which I managed to found:
  $xinput --watch-props 8
  Device 'Video Bus':
   Device Enabled (140):	0
   Coordinate Transformation Matrix (142):	1.000000, 0.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000
   Device Product ID (257):	0, 6
   Device Node (258):	"/dev/input/event7"
   Virtual Device (259):	1

  $cat /proc/bus/input/devices
  I: Bus=0019 Vendor=0000 Product=0006 Version=0000
  N: Name="Video Bus"
  P: Phys=LNXVIDEO/video/input0
  S: Sysfs=/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:19/LNXVIDEO:00/input/input7
  U: Uniq=
  H: Handlers=kbd event7
  B: PROP=0
  B: EV=3
  B: KEY=3e000b 0 0 0 0 0 0 0

  $lsinput -v
  /dev/input/event7
     bustype : BUS_HOST
     vendor  : 0x0
     product : 0x6
     version : 0
     name    : "Video Bus"
     phys    : "LNXVIDEO/video/input0"
     bits ev : EV_SYN EV_KEY

  I'm sure that it is not defective hardware-caused issue because: 1)
  Laptop has been diagnosed in service center, 2) There is no issues in
  MS Windows

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-image-3.2.0-31-generic-pae 3.2.0-31.50
  ProcVersionSignature: Ubuntu 3.2.0-31.50-generic-pae 3.2.28
  Uname: Linux 3.2.0-31-generic-pae i686
  NonfreeKernelModules: fglrx
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 2.0.1-0ubuntu13
  Architecture: i386
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: PCH [HDA Intel PCH], device 0: STAC92xx Analog [STAC92xx Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  zuker      2378 F.... pulseaudio
  CRDA:
   country AU:
    (2402 - 2482 @ 40), (N/A, 20)
    (5170 - 5250 @ 40), (3, 23)
    (5250 - 5330 @ 40), (3, 23), DFS
    (5735 - 5835 @ 40), (3, 30)
  Card0.Amixer.info:
   Card hw:0 'PCH'/'HDA Intel PCH at 0xf7c00000 irq 51'
     Mixer name	: 'Intel CougarPoint HDMI'
     Components	: 'HDA:111d76d1,102804b3,00100205 HDA:80862805,80860101,00100000'
     Controls      : 23
     Simple ctrls  : 11
  Date: Mon Oct  8 12:20:51 2012
  HibernationDevice: RESUME=UUID=1b4ff2b2-b40f-4b46-8a5c-29172cb6e299
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release i386 (20120423)
  MachineType: Dell Inc. Vostro 3550
  ProcEnviron:
   LANGUAGE=en_US:en
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-31-generic-pae root=UUID=88fd96e5-1fee-4a86-badb-87fe4d32cb0c ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.2.0-31-generic-pae N/A
   linux-backports-modules-3.2.0-31-generic-pae  N/A
   linux-firmware                                1.79.1
  SourcePackage: linux
  StagingDrivers: mei
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 09/30/2011
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A09
  dmi.board.name: 0PD77K
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A09
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: Not Specified
  dmi.modalias: dmi:bvnDellInc.:bvrA09:bd09/30/2011:svnDellInc.:pnVostro3550:pvrNotSpecified:rvnDellInc.:rn0PD77K:rvrA09:cvnDellInc.:ct8:cvrNotSpecified:
  dmi.product.name: Vostro 3550
  dmi.product.version: Not Specified
  dmi.sys.vendor: Dell Inc.

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