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[Bug 910536] Re: 8086:2a42 [Acer Aspire 5736Z] Screen too dark, no backlight, unusable X


Otto Kekäläinen, this bug was reported a while ago and there hasn't been
any activity in it recently. We were wondering if this is still an
issue? If so, could you please test for this with the latest development
release of Ubuntu? ISO images are available from
http://cdimage.ubuntu.com/daily-live/current/ .

If it remains an issue, could you please run the following command in
the development release from a Terminal
(Applications->Accessories->Terminal), as it will automatically gather
and attach updated debug information to this report:

apport-collect -p linux <replace-with-bug-number>

Also, could you please test the latest upstream kernel available (not the daily folder) following https://wiki.ubuntu.com/KernelMainlineBuilds ? It will allow additional upstream developers to examine the issue. Once you've tested the upstream kernel, please comment on which kernel version specifically you tested. If this bug is fixed in the mainline kernel, please add the following tags:

where VERSION-NUMBER is the version number of the kernel you tested. For example:

This can be done by clicking on the yellow circle with a black pencil icon next to the word Tags located at the bottom of the bug description. As well, please remove the tag:

If the mainline kernel does not fix this bug, please add the following tags:

As well, please remove the tag:

Once testing of the upstream kernel is complete, please mark this bug's
Status as Confirmed. Please let us know your results. Thank you for your

** Summary changed:

- 8086:2a42 Screen too dark, no backlight, unusable X
+ 8086:2a42 [Acer Aspire 5736Z] Screen too dark, no backlight, unusable X

** This bug is no longer a duplicate of bug 765438
   8086:2a42 [eMachines E527] On startup, the backlight is off on laptop

** Tags removed: has-workaround kernel-request-3.2.0-21.34 kernel-request-3.2.0-7.13 regression reproducible
** Tags added: bios-outdated-1.14 bot-stop-nagging

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  8086:2a42 [Acer Aspire 5736Z] Screen too dark, no backlight, unusable

Status in “linux” package in Ubuntu:

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

  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

  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
  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
   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
   PATH=(custom, no user)
  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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