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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

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


** Tags: amd64 apport-bug kernel-bug-exists-upstream kernel-request-3.0.0-11.17 kernel-request-3.0.0-11.18 kernel-request-3.0.0-12.19 kernel-request-3.0.0-12.20 oneiric running-unity
-- 
8086:2a42 No backlight display Acer Aspire 5734Z
https://bugs.launchpad.net/bugs/826386
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