no light with acer aspire 7715z

[Kristoff]

I never managed to control light with ubuntu (and kubuntu , fedora 14 debian 6), when linux started luminosity was maximum.
but between the 11.04 alpha 3 and beta 1 there were a change that made ubuntu start with no light (like i switched off my screen but i was able to see enough to make sure ubuntu started) on my computer i cant control luminosity so i didn't find a way to bring back light.

to resume: untill alpha 3 (11.04) my screen luminosity was maximum with ubuntu (and other linux)
since beta 1 after grub my screen becomes black and I didn't fid a way to light my screen
---
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21.
AplayDevices:
 **** List of PLAYBACK Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: ALC272 Analog [ALC272 Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
Architecture: i386
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: ALC272 Analog [ALC272 Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: kristoff 1449 F.... xfce4-volumed
                      kristoff 1510 F.... pulseaudio
                      kristoff 1544 F.... xfce4-mixer-plu
CRDA: Error: [Errno 2] Aucun fichier ou dossier de ce type
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xd6700000 irq 22'
   Mixer name : 'Realtek ALC272'
   Components : 'HDA:10ec0272,10250210,00100001'
   Controls : 16
   Simple ctrls : 9
DistroRelease: Ubuntu 10.04
Frequency: Once a day.
HibernationDevice: RESUME=UUID=31bd1a6c-e9ac-4227-a74f-25ad7af1c65b
InstallationMedia: Xubuntu 10.04.2 "Lucid Lynx" - Release i386 (20110214.1)
MachineType: Acer Aspire 7715Z
Package: linux (not installed)
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-30-generic-pae root=UUID=dcdff0dd-219a-4a4d-9364-c0a3e69678f7 ro quiet splash
ProcEnviron:
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.32-30.59-generic-pae 2.6.32.29+drm33.13
Regression: Yes
RelatedPackageVersions: linux-firmware 1.34.3
Reproducible: No
RfKill:
 0: phy0: Wireless LAN
  Soft blocked: no
  Hard blocked: no
Tags: lucid graphics regression-potential needs-upstream-testing
Uname: Linux 2.6.32-30-generic-pae i686
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
dmi.bios.date: 08/09/2010
dmi.bios.vendor: Acer
dmi.bios.version: V3.09
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: Aspire 7715Z
dmi.board.vendor: Acer
dmi.board.version: V3.09
dmi.chassis.type: 10
dmi.chassis.vendor: Acer
dmi.chassis.version: V3.09
dmi.modalias: dmi:bvnAcer:bvrV3.09:bd08/09/2010:svnAcer:pnAspire7715Z:pvrV3.09:rvnAcer:rnAspire7715Z:rvrV3.09:cvnAcer:ct10:cvrV3.09:
dmi.product.name: Aspire 7715Z
dmi.product.version: V3.09
dmi.sys.vendor: Acer

[Dave Gilbert (ubuntu-treblig)]

Hi,
  I assume you mean backlight on the display.

Can you please run

apport-collect 756579

It will add a load of information about your computer to this bug report.

Dave

[Kristoff (ze-retun-of-shadowcake)]

apport information

[Kristoff (ze-retun-of-shadowcake)]

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[Kristoff (ze-retun-of-shadowcake)]

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[Kristoff (ze-retun-of-shadowcake)]

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[Kristoff (ze-retun-of-shadowcake)]

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[Kristoff (ze-retun-of-shadowcake)]

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[Kristoff (ze-retun-of-shadowcake)]

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[Kristoff (ze-retun-of-shadowcake)]

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[Kristoff (ze-retun-of-shadowcake)]

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[Kristoff (ze-retun-of-shadowcake)]

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[Kristoff (ze-retun-of-shadowcake)]

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[Kristoff (ze-retun-of-shadowcake)]

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[Kristoff (ze-retun-of-shadowcake)]

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[Kristoff (ze-retun-of-shadowcake)]

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[Kristoff (ze-retun-of-shadowcake)]

apport information

[diehard67 (diehard67)]

I tripped over this link in ubuntus forums, explains the cause o0f the problem.
http://us.generation-nt.com/answer/2-6-38-rc2-acpi-backlight-control-missing-help-201853772.html

[penalvch (penalvch)]

Kristoff, thank you for reporting this and helping make Ubuntu better. Natty reached EOL on October 2012.
Please see this document for currently supported Ubuntu releases:
https://wiki.ubuntu.com/Releases

We were wondering if this is still an issue in a supported release? If so, could you please test for this with the latest development release of Ubuntu? ISO CD images are available from http://cdimage.ubuntu.com/releases/ .

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 following https://wiki.ubuntu.com/KernelMainlineBuilds ? It will allow additional upstream developers to examine the issue. Please do not test the kernel in the daily folder, but the one all the way at the bottom. Once you've tested the upstream kernel, please comment on which kernel version specifically you tested and remove the tag:
needs-upstream-testing

This can be done by clicking on the yellow pencil icon next to the tag located at the bottom of the bug description and deleting the text:
needs-upstream-testing

If this bug is fixed in the mainline kernel, please add the following tags:
kernel-fixed-upstream
kernel-fixed-upstream-VERSION-NUMBER

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

If the mainline kernel does not fix this bug, please add the following tags:
kernel-bug-exists-upstream
kernel-bug-exists-upstream-VERSION-NUMBER

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

If you are unable to test the mainline kernel, please comment as to why specifically you were unable to test it and add the following tags:
kernel-unable-to-test-upstream
kernel-unable-to-test-upstream-VERSION-NUMBER

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

Please let us know your results. Thank you for your understanding.

Helpful Bug Reporting Tips:
https://help.ubuntu.com/community/ReportingBugs

[Launchpad Janitor (janitor)]

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