[Dell Latitude E6430] FunctionKeys of brightness don't work

[mlchen]

cid: 201202-10552
it doesn't work whenever pressing the brightness-up button or brightness-down button.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: linux-image-3.2.0-29-generic 3.2.0-29.46
ProcVersionSignature: Ubuntu 3.2.0-29.46-generic 3.2.24
Uname: Linux 3.2.0-29-generic x86_64
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 2.0.1-0ubuntu12
Architecture: amd64
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: PCH [HDA Intel PCH], device 0: STAC92xx Analog [STAC92xx Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: ubuntu 1551 F.... pulseaudio
Card0.Amixer.info:
 Card hw:0 'PCH'/'HDA Intel PCH at 0xf7e30000 irq 46'
   Mixer name : 'Intel PantherPoint HDMI'
   Components : 'HDA:111d76df,10280534,00100203 HDA:14f12c06,14f1000f,00100000 HDA:80862806,80860101,00100000'
   Controls : 37
   Simple ctrls : 13
Date: Mon Nov 5 00:53:58 2012
HibernationDevice: RESUME=UUID=a7126f65-e66f-4eb5-9d0f-df7f738cf5f2
InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120823.1)
MachineType: Dell Inc. Latitude E6430
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-29-generic root=UUID=2bef066c-fb96-4702-b08d-4c7ae7c437fe ro quiet splash initcall_debug vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.2.0-29-generic N/A
 linux-backports-modules-3.2.0-29-generic N/A
 linux-firmware 1.79
SourcePackage: linux
StagingDrivers: mei
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 09/19/2012
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A06
dmi.board.name: 0CPWYR
dmi.board.vendor: Dell Inc.
dmi.board.version: X03
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA06:bd09/19/2012:svnDellInc.:pnLatitudeE6430:pvr01:rvnDellInc.:rn0CPWYR:rvrX03:cvnDellInc.:ct9:cvr:
dmi.product.name: Latitude E6430
dmi.product.version: 01
dmi.sys.vendor: Dell Inc.

[Anthony Wong (anthonywong)]

Please run 'acpidump -o acpidump.txt' and attach acpidump.txt to this bug.

[Erno Kuusela (erno-iki)]

Same on Latitude E6230

[Felix (felix-koenig)]

Unfortuntely, boot option acpi_backlight=vendor doesn't help either.

[Mikaël Urankar (mikael-urankar-s)]

Adding the following line in the "Screen" section of xorg.conf solved the problem :
Option "RegistryDwords" "EnableBrightnessControl=1"
cf launchpad bug report 762670 (https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/762670)

[penalvch (penalvch)]

mlchen, as per http://www.dell.com/support/troubleshooting/us/en/19/Product/latitude-e6430 an update is available for your BIOS (A12). If you update to this, does it change anything?

If not, could you please both specify what happened, and provide the output of the following terminal command:
sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date

Thank you for your understanding.

[arno_b (arno.b)]

This latest BIOS (A12) fixes the problem. Can change the brightness as expected.