Bug still present in Ubuntu 14.04.
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https://bugs.launchpad.net/bugs/910536
Title:
8086:2a42 [Acer Aspire 5736Z] Screen too dark, no backlight, unusable
X
Status in “linux” package in Ubuntu:
Expired
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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