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[Launchpad Bug Tracker <826386@xxxxxxxxxxxxxxxxxx>]

[Expired for linux (Ubuntu) because there has been no activity for 60
days.]

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

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https://bugs.launchpad.net/bugs/826386

Title:
  8086:2a42 No backlight display Acer Aspire 5734Z

Status in “linux” package in Ubuntu:
  Expired

Bug description:
  I first encountered this bug in Natty Narwhal. However my inexperience
  with working with Ubuntu prevented me from filing a proper bug report.
  Basically, what's happening is, the system starts to boot up, then the
  screen goes black. The computer is still running and booting normally,
  however, the back light for the display does not come on. This was
  confirmed by shining a light into the screen and seeing the Ubuntu
  desktop.

  I performed a fresh installation of Maverick Meerkat and then did an
  upgrade to Natty Narwhal. The same problem. However, when booted with
  a previous Linux kernel version, there is no problem. This leads me to
  believe the problem is with the kernel, and not Xorg as the back light
  fails to power on at kernel boot.

  This bug is also effecting the current Oneiric Ocelot build which is
  Alpha 3. This bug report pertains to Oneiric Ocelot.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: linux-image-3.0.0-8-generic 3.0.0-8.10
  ProcVersionSignature: Ubuntu 3.0.0-8.10-generic 3.0.1
  Uname: Linux 3.0.0-8-generic x86_64
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  AplayDevices:
   **** List of PLAYBACK Hardware Devices ****
   card 0: Intel [HDA Intel], device 0: ALC272X Analog [ALC272X Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  Architecture: amd64
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: Intel [HDA Intel], device 0: ALC272X Analog [ALC272X Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  ubuntu     4151 F.... pulseaudio
  CRDA: Error: [Errno 2] No such file or directory
  Card0.Amixer.info:
   Card hw:0 'Intel'/'HDA Intel at 0xd6700000 irq 46'
     Mixer name	: 'Realtek ALC272X'
     Components	: 'HDA:10ec0272,10250459,00100001'
     Controls      : 20
     Simple ctrls  : 12
  CasperVersion: 1.278
  Date: Sun Aug 14 16:47:43 2011
  LiveMediaBuild: Ubuntu 11.10 "Oneiric Ocelot" - Alpha amd64 (20110812)
  MachineType: Acer Aspire 5734Z
  ProcEnviron:
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: noprompt cdrom-detect/try-usb=true persistent file=/cdrom/preseed/hostname.seed boot=casper initrd=/casper/initrd.lz quiet splash -- nomodeset BOOT_IMAGE=/casper/vmlinuz
  RelatedPackageVersions:
   linux-restricted-modules-3.0.0-8-generic N/A
   linux-backports-modules-3.0.0-8-generic  N/A
   linux-firmware                           1.59
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 05/20/2010
  dmi.bios.vendor: Acer
  dmi.bios.version: V1.02
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: Aspire 5734Z
  dmi.board.vendor: Acer
  dmi.board.version: V1.02
  dmi.chassis.type: 10
  dmi.chassis.vendor: Acer
  dmi.chassis.version: V1.02
  dmi.modalias: dmi:bvnAcer:bvrV1.02:bd05/20/2010:svnAcer:pnAspire5734Z:pvrV1.02:rvnAcer:rnAspire5734Z:rvrV1.02:cvnAcer:ct10:cvrV1.02:
  dmi.product.name: Aspire 5734Z
  dmi.product.version: V1.02
  dmi.sys.vendor: Acer

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