Brightness does not work in Ubuntu 12.04

[philipballew]

After upgrading from Ubuntu 11.10 to 12.04 my back light keys stopped working. They were originally not working until I followed the steps by https://bugs.launchpad.net/ubuntu/+source/linux/+bug/872652 and now I do not have a working back light.

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ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: linux-image-3.2.0-18-generic 3.2.0-18.29
ProcVersionSignature: Ubuntu 3.2.0-18.29-generic 3.2.9
Uname: Linux 3.2.0-18-generic x86_64
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 1.94.1-0ubuntu2
Architecture: amd64
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: philip 2040 F.... pulseaudio
 /dev/snd/pcmC0D0p: philip 2040 F...m pulseaudio
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xf0a00000 irq 45'
   Mixer name : 'Intel IbexPeak HDMI'
   Components : 'HDA:111d7675,10280413,00100103 HDA:80862804,80860101,00100000'
   Controls : 23
   Simple ctrls : 11
Date: Fri Mar 9 21:31:41 2012
HibernationDevice: RESUME=UUID=2e75240d-4c5c-4da7-a7fd-a8cb96250abd
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
Lsusb:
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
 Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
 Bus 001 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
 Bus 002 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
 Bus 001 Device 003: ID 0c45:6417 Microdia Integrated Webcam
MachineType: Dell Inc. Studio 1558
ProcEnviron:
 TERM=xterm
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-18-generic root=UUID=3b7a598b-2ade-4ae1-ad04-1dd958d805eb ro acpi_backlight=dell_laptop.backlight=0 quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.2.0-18-generic N/A
 linux-backports-modules-3.2.0-18-generic N/A
 linux-firmware 1.71
SourcePackage: linux
StagingDrivers: mei
UpgradeStatus: Upgraded to precise on 2012-03-09 (0 days ago)
dmi.bios.date: 03/30/2011
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A12
dmi.board.name: 0G939P
dmi.board.vendor: Dell Inc.
dmi.board.version: A12
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: A12
dmi.modalias: dmi:bvnDellInc.:bvrA12:bd03/30/2011:svnDellInc.:pnStudio1558:pvrA12:rvnDellInc.:rn0G939P:rvrA12:cvnDellInc.:ct8:cvrA12:
dmi.product.name: Studio 1558
dmi.product.version: A12
dmi.sys.vendor: Dell Inc.

[Joseph Salisbury (jsalisbury)]

Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v3.3 kernel[1] (Not a kernel in the daily directory). Once you've tested the upstream kernel, please remove the 'needs-upstream-testing' tag(Only that one tag, please leave the other tags). 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 'needs-upstream-testing' text.

If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'.

If you are unable to test the mainline kernel, for example it will not boot, please add the tag: 'kernel-unable-to-test-upstream'.
Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".

Thanks in advance.

[1] http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.3-rc7-precise/

[philipballew (philipballew)]

I have tested the upstream kernel (3.3 amd64) and can say the back light is working again. Can we get this backported into 12.04 final release?

[penalvch (penalvch)]

philipballew, this bug was reported a while ago and there hasn't been any activity in it recently. We were wondering if this is still an issue? If so, could you please test for this with the latest development release of Ubuntu? ISO images are available from http://cdimage.ubuntu.com/daily-live/current/ .

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 (not the daily folder, but the one all the way at the bottom) following https://wiki.ubuntu.com/KernelMainlineBuilds ? It will allow additional upstream developers to examine the issue. Once you've tested the upstream kernel, please comment on which kernel version specifically you tested. 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. For example:
kernel-fixed-upstream-v3.12

This can be done by clicking on the yellow circle with a black pencil icon next to the word Tags located at the bottom of the bug description. As well, please remove the tag:
needs-upstream-testing

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

As well, please remove the tag:
needs-upstream-testing

Once testing of the upstream kernel is complete, please mark this bug's Status as Confirmed. Please let us know your results. Thank you for your understanding.

[Launchpad Janitor (janitor)]

[Expired for linux (Ubuntu) because there has been no activity for 60 days.]