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["Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>]

*** This bug is a duplicate of bug 765438 ***
    https://bugs.launchpad.net/bugs/765438

** Summary changed:

- Screen too dark, no backlight, unusable X
+ 8086:2a42 Screen too dark, no backlight, unusable X

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https://bugs.launchpad.net/bugs/910536

Title:
  8086:2a42 Screen too dark, no backlight, unusable X

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  I just did a fresh install of Precise on a Acer Aspire 5736Z with
  intel GMA 4500. When I booted the installer from a USB, the screen is
  OK in the boot menu (non-X) but as soon as X starts, the backlight of
  the screen turns off making the screen almost black, and thus
  unusable.

  Pressing Fn+Left Arrow does not increase screen brightness. Also
  pressing Fn+F6 (backlight on/off does not work).

  At the moment Precise is impossible to install on Acer Aspire 5736Z by
  a regular user. The laptop worked fine with Ubuntu 10.04, so this is a
  regression.

  Expected result: screen brightness should be higher and the user
  should be able to see what is on the screen.

  
  Workaround: If I boot the installer with kernel option acpi=off, the screen is still by default to dark, but pressing Fn+Left Arrow turns the backlight on and X becomes usable.

  After installation "acpi=off" is not remembered by the system, so I
  have to manually insert the option into Grub to make the change
  presistent and the user who boots the laptop needs to press Fn+Left
  Arrow at each boot after X has started (as it starts by default with
  backlight off and screen way too dark).

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: xorg 1:7.6+7ubuntu7
  ProcVersionSignature: Ubuntu 3.2.0-2.5-generic 3.2.0-rc3
  Uname: Linux 3.2.0-2-generic i686
  .tmp.unity.support.test.0:
   
  ApportVersion: 1.90-0ubuntu1
  Architecture: i386
  CompizPlugins: [core,bailer,detection,composite,opengl,decor,regex,snap,mousepoll,imgpng,resize,unitymtgrabhandles,place,animation,move,grid,vpswitch,gnomecompat,compiztoolbox,wall,session,workarounds,expo,ezoom,fade,scale,unityshell]
  CompositorRunning: compiz
  Date: Sun Jan  1 15:03:36 2012
  DistUpgraded: Fresh install
  DistroCodename: precise
  DistroVariant: ubuntu
  EcryptfsInUse: Yes
  ExtraDebuggingInterest: Yes, if not too technical
  GraphicsCard:
   Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller [8086:2a42] (rev 09) (prog-if 00 [VGA controller])
     Subsystem: Acer Incorporated [ALI] Device [1025:048a]
     Subsystem: Acer Incorporated [ALI] Device [1025:048a]
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha i386 (20111129.1)
  MachineType: Acer Aspire 5736Z
  ProcEnviron:
   PATH=(custom, no user)
   LANG=fi_FI.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-2-generic root=UUID=743be841-a164-4092-9bd9-36acdcae5994 ro quiet splash vt.handoff=7 acpi=off noapic nolapic
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/17/2010
  dmi.bios.vendor: Acer
  dmi.bios.version: V1.03
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: JE51_MV
  dmi.board.vendor: Acer
  dmi.board.version: V1.03
  dmi.chassis.type: 10
  dmi.chassis.vendor: Acer
  dmi.chassis.version: V1.03
  dmi.modalias: dmi:bvnAcer:bvrV1.03:bd08/17/2010:svnAcer:pnAspire5736Z:pvrV1.03:rvnAcer:rnJE51_MV:rvrV1.03:cvnAcer:ct10:cvrV1.03:
  dmi.product.name: Aspire 5736Z
  dmi.product.version: V1.03
  dmi.sys.vendor: Acer
  version.compiz: compiz 1:0.9.6+bzr20110929-0ubuntu7
  version.libdrm2: libdrm2 2.4.27-1ubuntu1
  version.libgl1-mesa-dri: libgl1-mesa-dri 7.11-0ubuntu4
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 7.11-0ubuntu4
  version.xserver-xorg-core: xserver-xorg-core 2:1.10.4-1ubuntu5
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.6.0-1ubuntu13
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.99~git20110811.g93fc084-0ubuntu1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.15.901-1ubuntu3
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20110411+8378443-1

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