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[Alan Pater <alan.pater@xxxxxxxxx>]

I ran FWTS on my system and it gave the following:

ADVICE: The ACPI video driver has found a duplicate ACPI video bus device for
the same VGA controller. If the current driver does not work, one can try to
work around this using the video.allow_duplicates=1 kernel parameter.

Note: Dell D420, Ubuntu 14.04, kernel: 3.11.0-14

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https://bugs.launchpad.net/bugs/995456

Title:
  Duplicate ACPI video bus devices for the same VGA controller

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  The same bug in:
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/938631

  I have Ubuntu 11.10 with all the last update.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: linux-image-3.0.0-19-generic 3.0.0-19.33
  ProcVersionSignature: Ubuntu 3.0.0-19.33-generic 3.0.27
  Uname: Linux 3.0.0-19-generic x86_64
  NonfreeKernelModules: wl
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  AplayDevices:
   **** List of PLAYBACK Hardware Devices ****
   card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  ApportVersion: 1.23-0ubuntu4
  Architecture: amd64
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  daniele    1941 F.... pulseaudio
  CRDA: Error: [Errno 2] File o directory non esistente
  Card0.Amixer.info:
   Card hw:0 'Intel'/'HDA Intel at 0xf6fdc000 irq 47'
     Mixer name	: 'IDT 92HD71B7X'
     Components	: 'HDA:111d76b2,1028024f,00100302'
     Controls      : 15
     Simple ctrls  : 10
  Date: Sun May  6 14:28:38 2012
  HibernationDevice: RESUME=UUID=c757a0dc-e6d0-474f-a874-73d8eabbafdc
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
  MachineType: Dell Inc. Latitude E6500
  PccardctlIdent:
   Socket 0:
     no product info available
  PccardctlStatus:
   Socket 0:
     no card
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-19-generic root=UUID=5a3064d5-8e85-4983-9541-82de5f238f2b ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.0.0-19-generic N/A
   linux-backports-modules-3.0.0-19-generic  N/A
   linux-firmware                            1.60
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/06/2011
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A27
  dmi.board.asset.tag: 4Q9XX3J
  dmi.board.vendor: Dell Inc.
  dmi.chassis.asset.tag: 4Q9XX3J
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA27:bd12/06/2011:svnDellInc.:pnLatitudeE6500:pvr:rvnDellInc.:rn:rvr:cvnDellInc.:ct8:cvr:
  dmi.product.name: Latitude E6500
  dmi.sys.vendor: Dell Inc.

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