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[Photon <michael.kogan@xxxxxxx>]

I encountered this problem on an HP Compaq CQ58-d69sg right now. The
kernel option acpi_backlight=vender fully solved the problem (backlight
control with the keyboard also works properly).

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https://bugs.launchpad.net/bugs/765438

Title:
  8086:2a42 [eMachines E527] On startup, the backlight is off on laptop

Status in The Linux Kernel:
  Fix Released
Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  When Ubuntu starts up, the back-light is off on my laptop.  I can plug
  it into an external monitor and the display is fine.  I can easily
  turn the back-light on with "sudo setpci -s 00:02.0 F4.B=[HEX]" where
  00 is the brightest and FF is off.  In past distributions, the GUI-
  based brightness utilities did not work and I used this command to
  change by back-light brightness.  I know that there are many people
  who can not use back-light GUI-utilities on the past distributions as
  well.  This issue also occurs if I close my screen and raise it again.

  This issue also effected the installation process as well as when I
  was using the i686 installer.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.04
  Package: xorg 1:7.6+4ubuntu3
  ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
  Uname: Linux 2.6.38-8-generic x86_64
  Architecture: amd64
  CompizPlugins: [core,bailer,detection,composite,opengl,decor,mousepoll,vpswitch,regex,animation,snap,expo,move,compiztoolbox,place,grid,imgpng,gnomecompat,wall,ezoom,workarounds,staticswitcher,resize,fade,unitymtgrabhandles,scale,session,unityshell]
  CompositorRunning: compiz
  CurrentDmesg:
   [   29.430043] eth0: no IPv6 routers present
   [   30.988586] EXT4-fs (sda7): re-mounted. Opts: errors=remount-ro,commit=0
  DRM.card0.DP.1:
   status: disconnected
   enabled: disabled
   dpms: Off
   modes:
   edid-base64:
  DRM.card0.LVDS.1:
   status: connected
   enabled: enabled
   dpms: On
   modes: 1366x768
   edid-base64: AP///////wANr5kVAAAAAAcUAQOAIhN4Cj2VlFZPjigmUFQAAAABAQEBAQEBAQEBAQEBAQEBeh1W0lAAHjA8KDYAWMEQAAAYAAAA/gBOMTU2QjMtTDBCCiAgAAAA/gBDTU8KICAgICAgICAgAAAA/gBOMTU2QjMtTDBCCiAgAEg=
  DRM.card0.VGA.1:
   status: disconnected
   enabled: disabled
   dpms: Off
   modes:
   edid-base64:
  Date: Mon Apr 18 21:34:59 2011
  DistUpgraded: Fresh install
  DistroCodename: natty
  DistroVariant: ubuntu
  GdmLog1:

  GdmLog2:

  GraphicsCard:
   Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller [8086:2a42] (rev 09) (prog-if 00 [VGA controller])
     Subsystem: Acer Incorporated [ALI] Device [1025:0459]
     Subsystem: Acer Incorporated [ALI] Device [1025:0459]
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Beta amd64 (20110413)
  MachineType: eMachines eMachines E527
  ProcEnviron:
   LANGUAGE=en_US:en
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-8-generic root=UUID=83376c0e-9440-4ba9-bbdb-363565bf5e72 ro quiet splash vt.handoff=7
  Renderer: Unknown
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/16/2010
  dmi.bios.vendor: eMachines
  dmi.bios.version: V1.01
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: eMachines E527
  dmi.board.vendor: eMachines
  dmi.board.version: V1.01
  dmi.chassis.type: 10
  dmi.chassis.vendor: eMachines
  dmi.chassis.version: V1.01
  dmi.modalias: dmi:bvneMachines:bvrV1.01:bd04/16/2010:svneMachines:pneMachinesE527:pvrV1.01:rvneMachines:rneMachinesE527:rvrV1.01:cvneMachines:ct10:cvrV1.01:
  dmi.product.name: eMachines E527
  dmi.product.version: V1.01
  dmi.sys.vendor: eMachines
  version.compiz: compiz 1:0.9.4+bzr20110411-0ubuntu1
  version.ia32-libs: ia32-libs 20090808ubuntu12
  version.libdrm2: libdrm2 2.4.23-1ubuntu6
  version.libgl1-mesa-dri: libgl1-mesa-dri 7.10.2-0ubuntu1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 7.10.2-0ubuntu1
  version.xserver-xorg: xserver-xorg 1:7.6+4ubuntu3
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.0-0ubuntu4
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.14.0-4ubuntu7
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20110107+b795ca6e-0ubuntu7

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