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[Launchpad Bug Tracker <934707@xxxxxxxxxxxxxxxxxx>]

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Booting to a black screen, however a flashlight shows a faint login window.  I can login, hear the startup sound, but still a black screen.
Again a flashlight on the screen shows a faint desktop.  I am assuming the backlight on the laptop is not responding.  Pressing the function key and brightness adjustment keys does nothing.

As a work around, adding the boot paramater acip_osi=Linux to Grub on
startup allows me to have a screen,  However, the function dim keys make
it brighter while the function brighter keys make the screen dimmer.

lsb_release -rd
Description:	Ubuntu precise (development branch)
Release:	12.04

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: xorg 1:7.6+10ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-16.25-generic 3.2.6
Uname: Linux 3.2.0-16-generic x86_64
NonfreeKernelModules: wl
.tmp.unity.support.test.0:
 
ApportVersion: 1.91-0ubuntu1
Architecture: amd64
CompizPlugins: [core,bailer,detection,composite,opengl,compiztoolbox,decor,dbus,mousepoll,regex,imgpng,gnomecompat,place,animation,session,move,resize,snap,vpswitch,winrules,grid,fade,workarounds,cube,expo,ezoom,scale,rotate,unityshell]
CompositorRunning: compiz
Date: Fri Feb 17 22:26:05 2012
DistUpgraded: Fresh install
DistroCodename: precise
DistroVariant: ubuntu
DkmsStatus:
 bcmwl, 5.100.82.38+bdcom, 3.2.0-15-generic, x86_64: installed
 bcmwl, 5.100.82.38+bdcom, 3.2.0-16-generic, x86_64: installed
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 [1025:0212]
   Subsystem: Acer Incorporated [ALI] Device [1025:0212]
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 (20120119)
MachineType: eMachines eMachines E725
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-16-generic root=UUID=5dad1fe6-2c79-4412-ae39-0307a2f6db3e ro acpi_osi=Linux
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 12/16/2009
dmi.bios.vendor: eMachines
dmi.bios.version: V3.04
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: eMachines E725
dmi.board.vendor: eMachines
dmi.board.version: V3.04
dmi.chassis.type: 10
dmi.chassis.vendor: eMachines
dmi.chassis.version: V3.04
dmi.modalias: dmi:bvneMachines:bvrV3.04:bd12/16/2009:svneMachines:pneMachinesE725:pvrV3.04:rvneMachines:rneMachinesE725:rvrV3.04:cvneMachines:ct10:cvrV3.04:
dmi.product.name: eMachines E725
dmi.product.version: V3.04
dmi.sys.vendor: eMachines
version.compiz: compiz 1:0.9.7.0~bzr2995-0ubuntu4
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.30-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 8.0~rc2-0ubuntu5
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 8.0~rc2-0ubuntu5
version.xserver-xorg-core: xserver-xorg-core 2:1.11.4-0ubuntu3
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.6.99.901+git20120126-0ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.99~git20111219.aacbd629-0ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.17.0-1ubuntu4
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20111201+b5534a1-1build2

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug compiz-0.9 has-workaround kernel-bug-exists-upstream kernel-da-key kernel-handoff-graphics precise single-occurrence ubuntu
-- 
8086:2a42 emachine e725 boots to valid display with no backlight
https://bugs.launchpad.net/bugs/934707
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